So for instance if I have created a really great product for Ubuntu which is fully free and in my PPA, and my product would help a lot of people, would it be considered promotional spam if I were to post a Q&A where I ask a question, and then provide my product as the solution? Or would that by looked upon badly?
Speaking generally, if...
- It's relevant; it answers the question(s), and
- You disclose your interest, and
- You don't plaster the site with it...
... We have no problem with it. If somebody has a useful and helpful thing to share with us, I think we can accept that sometimes the people posting it might occasionally have a vested interest in that.
I'd look much less favourably on something —and someone— if they set up a question just to answer it with their product. While self-answering is generally seen as fine, you stretch its external usefulness when you start doing it to promote your own stuff.
And we start handing out suspensions like free candy if you start doing that from different accounts. AstroTurfing is toxic. Recommendations must be based on personal views.
If you suspect anything of falling foul of these guidelines, flag it up and we'll have a look.