Social Like/share should be on topic rather than on comments
Is there any special reason why like/share options are present in comments and not in the main topic?
It is more likely to share an entire topic than to share a single comment. Besides it will make the comments section cleaner.
Ok, that looked to me more like sharing the whole project, I think it is a bit out of context there.
Then I'd suggest to move it to be below the topic like in most blogs and news sites (and maybe remove the comments sharing?)
The reason is (at least for facebook), that the higher number of shares a canonical url has, the more visibility it is given on the social network. So, somehow forcing the user to share/like the entire topic rather than comments separately will make the entire topic stronger and better ranked.
You should also check and optimize pages for facebook, see the diagnose for this post for example: http://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Ffeedback.userecho.com%2Ftopic%2F60227-social-likeshare-should-be-on-topic-rather-than-on-comments