!Rant
Hey, Does anyone use a forum platform in the company for tech questions?

Many years ago, we used Yammer! I'm not sure what it's like now it's owned by Microsoft, but it worked reasonably well for question/answer type stuff. Also used Google+ groups (don't ask - we were a Google-affiliated organisation) but they weren't great.

I think they're a good idea, but you need a few contributors to make it work. If they end up dominated by a small group of people people, they can become ghost towns very quickly.