Possible Duplicate:
Tag requirement issue when editing question on Facebook.Stackoverflow mini site
As said in my answer's comment, I'm creating a new question about like, facebook-like problem.
What is problematic:
When you want to submit question with tags only related to Facebook, it does not allow you to do so:
What's result of this limitation:
A lot of people do use like and other not-Facebook-related tags just to get around this limitation, without adding any meaningful information. It accomplishes nothing except clutter.
What I propose:
I'd propose to delete this limitation. I think it would get rid of most problems with Facebook tags.