Which social platform is best for promoting a SaaS product?
Short answer
The one where your users already are, which is often not the one founders default to. X and LinkedIn suit B2B and developer tools; Reddit and specialist forums suit anything with a passionate niche; TikTok and Instagram suit consumer products with visual before-and-after value; YouTube suits anything that needs demonstrating. The mistake is choosing by which platform you personally enjoy rather than by where the buying conversation happens.
The longer version
The one where the people who would buy your product already talk about the problem it solves. That sounds obvious and is routinely ignored, because founders pick the platform they personally enjoy using rather than the one their buyers are on.
Roughly: X and LinkedIn work for B2B and developer tools, where the buying conversation is professional and public. Reddit and specialist forums work for anything with a passionate niche, though they punish self-promotion harder than anywhere else. TikTok and Instagram work for consumer products with visible before-and-after value. YouTube works for anything that needs demonstrating before it makes sense.
The test to run before committing months to a platform: go there and search for the problem in the words your users would use, not the words you would use. If you find people actively complaining, you have found your platform. If you find nothing, no amount of posting will create the demand — you are in the wrong room.
One platform done properly beats four done occasionally. The compounding comes from showing up consistently in one place long enough for people to recognise your name.
The full argument, with the rest of the picture around it:
Every Way to Promote a Product, and Why Developers Get Each One Wrong