[acheron]

Livejournal's "mood icons" were the first thing I thought of.

(Though the standing joke with LJ was that they could save space by eliminating all the mood icons except for "angsty"...)

[pdx6]

Same here, and I think that may have been the idea. One of the things I loved about LJ was the ability to set moods, nested commenting, and a community spirit. Mood likes, better commenting, and Groups have started to adopt this LJ spirit (as much as don't want to admit).