How to judge social media agencies reviews and verify claims before shortlisting

What to take away

Why reviews of social media agencies need a method

A marketing manager in Leeds shortlisting agencies will find hundreds of reviews. Many were collected by the agency itself, published on its own site, or written by someone who never saw a monthly report. That does not make them worthless. It makes them a starting point rather than a verdict.

The useful question is not whether an agency is good. It is good at what, for whom, and measured how? A shop that runs sharp TikTok work for a fashion brand may be a poor fit for a B2B software firm selling into procurement teams.

Reviews also age quickly. Account teams move on, platforms retire ad formats, and an agency's best case study may date from a period when the senior staff who delivered it have since left. Treat anything older than roughly eighteen months as background rather than current evidence.

Sample size matters too. One delighted client is an anecdote. Five clients in your sector describing similar working patterns is a signal you can plan around. Where a directory shows only a handful of reviews, ask how long the listing has existed and how reviews are invited.

Check what a verified review badge actually proves. Verification usually confirms an email address or an account relationship rather than the results described. Useful, but a long way from a signed-off case study.

If you want a structured way to shortlist before scoring begins, our agency selection checklist for England sets out what to settle in the first week, from scope and ownership of accounts to notice periods.

What a credible review actually contains

Credible reviews name the client sector, the scope of work and the period covered. They say what changed: follower growth, cost per lead, response times, share of voice. They also say what did not work.

Be sceptical of reviews that only describe feelings. "Great to work with" tells you little about whether the agency hit a cost per acquisition target. A review that lists impressive numbers without a baseline is just as hard to check.

The strongest reviews come from named contacts you can approach yourself. An anonymous review can still shape your questions, but it cannot carry weight in a scoring exercise.

Negative reviews deserve the same scrutiny as positive ones. A one-star complaint about a missed deadline may reflect an unrealistic brief. A pattern of complaints about reporting delays is a warning you can act on at reference stage.

A review written two years after the work finished reads differently from one written during the retainer. Recency helps, though a candid retrospective can be more useful than a glowing note sent mid-project.

It also helps to know who is actually trading in the market. Our round-up of the best social media agency providers in England covers the main names, the sectors they serve and how they position themselves. That makes it easier to spot a review that does not match the agency you are reading about.

The evidence you can check yourself

Before you weigh any opinion, check the public record. Company accounts, filing history and director appointments are free to view, and they show whether an agency is growing, shrinking or repeatedly changing its registered name.

For regulated claims, the Advertising Standards Authority publishes a list of non-compliant online advertisers, including social media advertisers that have refused to comply with rulings. A quick search tells you whether a name on your shortlist has already been flagged.

If an agency will handle email lists, newsletters or lead nurture alongside social media management, read the ICO's guidance on direct marketing using electronic mail before you sign. Consent rules there shape how social campaigns can feed an email programme.

Two further checks take minutes. Confirm the registered number on the quote matches the company record, and ask whether professional indemnity cover is in place. Both answers belong in your tender file, dated.

Finally, search the agency's name alongside the platforms it claims to specialise in. A verified badge or partner status should be checkable in the platform's own directory. If it is not, ask for evidence in writing.

Create one file per agency: company number, filing date, ASA search result, insurance confirmation, reference notes and scores. When the tender ends, that file is your audit trail.

Building a scoring rubric you can defend

A rubric turns a pile of reviews into a comparable score. It also protects you when a stakeholder favours a different agency for reasons nobody can articulate. Publish the weights before anyone scores anything.

The table below is an illustrative example for a mid-sized UK business whose retainer sits around £4,000 a month. Adjust the weights to match your own priorities; the value lies in fixing them in advance.

Score each criterion from one to five, multiply by the weight, then total the weighted column. Three means acceptable but unproven. Five requires documentary evidence you have seen with your own eyes.

Who scores matters as much as what you score. A panel of two is too narrow. Six is unwieldy. Three or four people, each close to a different part of the decision, give you a fair spread without turning this into a committee.

Two rules keep the exercise honest. Score independently before the group meets, so the loudest voice does not anchor everyone else. Then record the evidence behind each mark in a single line.

Decide in advance how you will handle a tie. One option is to raise the weight on the criterion that matters most to the business, such as compliance, and re-score. Another is to invite both agencies to a second, narrower presentation on that topic.

Keep the completed rubric in your tender file. If the decision is later questioned, you can show exactly why one agency beat another.

For a fuller explanation of how evidence is gathered, weighed and published on this site, read our review methodology for social media agencies.

Turning reviews into reference calls

Reviews tell you who to call. Reference calls tell you what happened. Ask each shortlisted agency for three clients, ideally two current and one that left within the past year.

On the call, ask how the agency handled a missed target. Ask who wrote the monthly report, and whether the client could see the ad account directly. Ask what notice period applied and how the handover went.

A client who left on good terms and explains why is more useful than three glowing testimonials. Departures reveal an agency's real weaknesses: scope creep, slow approvals, junior staffing, or reporting that arrived too late to act on.

Allow half an hour per call and use the same question template for every agency. Consistency is what makes the calls comparable. One enthusiastic conversation should not outweigh two lukewarm ones.

If an agency cannot supply a client who has left, ask why. Long average tenure is a good sign but not a substitute for evidence. A refusal to provide any reference at all is a decision in itself.

Comparing agencies on cost without comparing apples to oranges

Quotes are rarely like for like. One agency bundles media spend into a single fee. Another charges a management percentage on top of spend. One includes creative production while another bills it separately.

Ask every agency to price the same defined scope: number of channels, posts per month, reporting cadence, paid media budget and hours of strategy support. Then compare the totals.

If you want typical fee bands and the drivers behind them, our guide to social media agency costs and budget structures breaks down the main pricing models and where hidden costs tend to appear.

Suspiciously low quotes usually mean fewer hours, less senior input or reporting that is largely automated. That can be fine for a single-channel account. It is rarely fine for a multi-market programme.

Watch for costs that appear after signature: extra creative rounds, ad hoc reporting requests, platform fees and travel. Ask for these to be listed as day rates in the contract, and check how much notice you must give to leave.

Compare the fee with your in-house option before you sign anything. A part-time coordinator plus a freelance designer is a different product, but the comparison tells you what the agency fee actually buys.

For example, a team paying £4,000 a month on a twelve-month retainer commits £48,000 before any media spend is counted. Rank quotes on that total, not the monthly figure.

Where independent reviews and platform data fit

Third-party directories, trade press and review platforms each carry bias. Directories may rank by subscription tier. Review platforms can be gamed by solicited reviews. Trade coverage often follows an agency's own announcements.

Platform directories are the most reliable source for partner status and certifications, because the platform controls the listing. Review directories are the least reliable on that point.

Awards are worth reading for the entry criteria as much as the winner. A category judged on a written submission rewards good writing. A category judged on results rewards measurement. Know which one you are looking at.

Use demographic data to sanity-check audience claims. The Office for National Statistics publishes internet access and social media usage data for Great Britain, broken down by age and other characteristics. It helps you judge whether a channel plan matches your actual buyers.

If an agency claims its audience skews a certain way, ask which source it used. A claim that contradicts published national data is not automatically wrong, but it needs explaining.

Read a spread of sources rather than one. Our survey of agency reviews in England explains how to weigh directory listings against client references when the two disagree.

Questions to ask about data, consent and children

Social media marketing touches personal data constantly: lookalike audiences, retargeting lists, lead forms and direct messages. The ICO's guide to data protection for organisations is the reference point for handling that data, covering lawful basis, retention and individual rights.

Ask each agency who acts as controller and who as processor. Ask where data is stored, how long it is kept, and how a subject access request arriving through a social inbox is handled.

Where campaigns could reach children, the rules tighten. Part 3 of the Digital Economy Act 2017 contains statutory provisions on online advertising and connected matters, including restrictions relating to advertising to children. Any agency working with youth-facing brands should explain how it applies that in practice.

If a campaign will reach under-18s, ask how the agency assesses age and excludes people it should not target. The answer should describe a documented process rather than a general assurance.

Ask for one worked example of a campaign that changed because of a compliance concern. The answer tells you more about how an agency operates than any policy document it sends over.

Give the compliance answers to whoever owns risk in your business, not just marketing. A short conversation with legal or data protection before signing is cheaper than fixing a consent problem afterwards.

Common questions

How many reviews should I read before shortlisting?

Enough to spot patterns rather than outliers. For five or six agencies, aim for at least three independent sources each, then verify the strongest claims by reference call. Consistency matters more than volume.

Are agency-published case studies worth anything?

Yes, as a source of questions. Treat every figure as a claim to test. Ask for the baseline, the measurement period and whether the client will confirm the numbers directly.

Should I trust star ratings on review platforms?

Use them to sort, not to decide. Check how the reviews were collected, whether the agency solicited them and whether negative reviews received a substantive reply. A well-handled complaint often says more than a five-star summary.

How often should we re-run the comparison?

Annually for a standard retainer, or sooner if performance drifts, the account team changes or your priorities shift. Re-score the incumbent on the same rubric as challengers so the comparison stays fair.