zlacker

Are they commonplace, moreso than most / many other sites, and is MF otherwise restricted to cat pics?

Or are many discussions on MF generally constructive and productive?

My experience, dipping into it (I'm not a member/regular) is the latter. Backed by some quantitative/qualitative research:

https://old.reddit.com/r/dredmorbius/comments/3hp41w/trackin...