There is a post today that seems over the line for an ad to me (I voted to close), but it also seems reasonable for people or companies developing bicycle related technologies and gear to want feedback. Do we have clear guidance about appropriate ways to ask those questions? I didn't find anything…
"We've got a cool product on Kick Starter, take a look and give us feedback" seems to be just on the wrong side of the line to me.
"We've got an idea for a product (possibly with a link to a website) and would like to know what features matter to you" seems like it would be ok.
The difference, as I see it, is that the second version asks (or could be asking) a general and keeps the discussion on SE. The first version takes the discussion away and asks for a response to a specific product.