There is a specific kind of customer who will give you a glowing testimonial and never fill out a single form: the one who lives in Slack. They pinged your shared channel at 9pm to say the new export saved their launch. They dropped three fire emojis when a bug they reported got fixed the same day. They have told you, in writing, a dozen times over that you are worth the money — and every one of those sentences is sitting in a channel your marketing team never reads. Meanwhile the testimonial request you emailed them is unopened, buried under two hundred other threads, because for this person email is the archive, not the inbox. This guide is about meeting them where they actually talk.
Why the Slack customer is a testimonial goldmine, not a lost cause
The instinct with a non-responsive customer is to assume they are indifferent. For the Slack-native customer the opposite is usually true — they are so engaged that they treat you like a teammate, and teammates get pinged, not emailed.
- The praise is unsolicited, which makes it credible. A quote a customer typed into a working channel, unprompted, in the middle of getting their job done, is the most honest testimonial there is. Nobody performs enthusiasm for a support thread. That authenticity is exactly what a prospect is scanning for.
- The specificity is already there. Slack praise names the thing: "the bulk import just cleared our 4,000-row backlog in one go." That concreteness is the hardest part of a good testimonial to manufacture, and here the customer volunteers it for free.
- The relationship is warm and continuous. You are not a vendor they think about once a year at renewal — you are a tab they have open all day. That closeness is precisely the goodwill that makes a testimonial ask feel like a small favor between people who already work together.
Watch the channel like it is a testimonial feed — because it is
The reason these quotes evaporate is organizational: the person reading the shared channel is in support or CS, and the person who needs testimonials is in marketing, and the two never connect. Close that gap and the channel becomes a pipeline.
- Save the moment when it happens. The second a customer drops a specific bit of praise, react with an emoji and copy the message text somewhere durable — a shared doc, a testimonial tracker, anywhere it won't scroll away. Slack messages age out of easy reach fast; the quote you don't capture today is gone by next week.
- Flag the ones with a before-and-after. The strongest Slack praise names a problem and its resolution in the same breath: "we were dreading the migration and honestly it was a non-event." That structure is what convinces a skeptical prospect, so mark those the moment they land.
- Let CS and marketing share the channel. The single highest-leverage change is making sure whoever owns testimonials can actually see the praise. A weekly "did anyone say anything quotable this week?" habit turns ambient goodwill into a list.
Ask right there, in the thread, while the praise is fresh
Once someone has said something great in Slack, do not switch channels to make the ask. Moving them to email to "make it official" is how you lose them — it drops the request into the exact medium they ignore. Ask in the place they just spoke.
- Reflect their words back in the thread. "You just said the import cleared your whole backlog in one go — that's a perfect line. Mind if we quote you on it?" Quoting their own sentence back makes yes the easy answer, because they don't have to write anything new.
- Do the formatting for them. Turn their message into one clean sentence with their name and title and paste it right back: "Something like this — 'edit or just thumbs-up.'" A Slack customer will react with an emoji to approve in three seconds; they will not open a Google Form.
- Ask for the name and title once. The only thing a Slack quote usually lacks is attribution. A single "can I credit you as [Name], [Title] at [Company]?" — answered with a checkmark — turns a casual message into a publishable, attributed testimonial.
Build the capture into how you already run the channel
The Slack customer is not hard to get a testimonial from — they hand you material every week. What is hard is remembering that the shared channel is a marketing asset and not just a support queue. The fix is a habit, not a campaign: react-and-save every specific bit of praise, flag the ones with a clear before-and-after, ask for the quote inside the thread while it is warm, and collect the name and title with a one-line reply. Do that consistently and the customer who would never answer an email becomes one of your most reliable sources of proof — because you finally started collecting the testimonials they were already writing.