Favorite Place to Lurk?

Hi folks, I'm doing a quick survey FOR SCIENCE.

Just a simple question, if you'd please:

What is your favorite social network (FB, PIN, TBLR, TWT, IG, SNAP, etc etc.) to diddle around with and why?

I mean this moreso within the context of leisure rather than IM, though I'm sure many of us have a hard time separating the two.

Thank you much in advance if you choose to help by replying!