Social proof: build a numbers inventory with a single source
When the same number shows up in three versions, trust drops. See how to build a proof inventory, with a source, date and owner for every number, and how to get a case study number approved.
Social proof loses strength when the same number shows up in three versions: one on the website, another on LinkedIn, a third in last week's post. Whoever compares them distrusts all three. The way out is a proof inventory, a spreadsheet where every company number has an approved sentence, a source, the date of the data and an owner. Every channel copies from it, and nobody writes a number from memory.
Why different numbers undermine social proof
A scale number only convinces if it's the same everywhere the reader looks. Whoever is evaluating a vendor, often an entire buying committee, opens the website, goes through LinkedIn and sees two or three posts. If each one says something different, the doubt moves from the number to the company.
We saw this at a client of ours. The website, the LinkedIn page and two posts carried different versions of three company numbers: employees, operating volume and states served. It's exactly the kind of problem a single source of reference solves.
The types of proof that go into the inventory
Everything the company uses as a trust argument goes into the spreadsheet, held to the same standard. The most common types:
- Scale: employees, locations, clients served, regions.
- Time in the market: founding year, years in operation.
- Clients: authorized names and logos, industries served.
- Results: case study numbers, always approved by the client.
- Recognition: awards, certifications and rankings, with the year.
The proof spreadsheet
Each row is a number, and each column answers a question someone will ask one day.
| Column | What goes in it |
|---|---|
| Number | the exact value, with its unit |
| Approved sentence | the sentence as it can appear in public |
| Source | the report, system or document it comes from |
| Date of the data | the month and year the number refers to |
| Owner | who is accountable for it (HR, finance, sales) |
| Where it appears | website, LinkedIn, sales deck, proposals |
| Next review | when the number should be checked again |
Beyond keeping things organized, the source column protects the company. In Brazil, the Consumer Protection Code already requires advertisers to keep the factual, technical and scientific data that supports the message (article 36). Even when you sell to other companies, it's a good standard.
Who updates it, and when
Each number has an owner outside marketing, and marketing looks after the spreadsheet. HR confirms headcount, finance confirms what comes from revenue, sales confirms clients. The review happens on a fixed date, with one simple question for each owner: is the number still valid?
Beyond the review, three events call for an immediate update: a new milestone (one more state, an award), a change in positioning and a new case study. The inventory also helps you check whether your message passes the brand positioning swap test.
When a number changes
When a number changes, it changes everywhere listed in the “where it appears” column, in the same week. A short routine:
- update the row in the spreadsheet, with the new date and source;
- change the number on the website and the LinkedIn page;
- tell sales, who use the number in decks and proposals;
- for old posts, decide whether to edit them or leave them as a record of the time, with the date visible.
How to ask a client to approve a case study number
A case study number only goes in with the data from the report and the client's approval, which is the rule on our own website. To ask for that approval without back-and-forth:
- take the number from the report or dashboard, with the period it refers to;
- write the exact sentence it will appear in and where it will be published;
- send it to the client for written approval;
- record the approval in the spreadsheet, with the date.
Our case study pages follow the same rule of only publishing numbers with a source, and the articles on the Franq case study and the Orbenk case study show where each result comes from. If you want to organize your brand's proof before the next planning cycle, that's the kind of work we do in marketing planning.
Talk to usWant help planning this at your company?Tell us what you need. We'll reply by email or WhatsApp and, if it makes sense, put together a quote.Contact us
Frequently asked questions
What is social proof in marketing?
Any signal that other people and companies already trust yours: scale numbers, clients, case study results, testimonials and recognition.
How often should you review social proof numbers?
On a fixed date, agreed with each number's owner, and whenever there's a new milestone. What matters is that the review happens before someone copies an outdated number.
