Wow, so I have been on this site for a while, certainly not the longest but I thought I knew my way around. I'll fully admit, the activity stream is something I hadn't used a lot before but I'm trying to be better about it now. But I've been using it for a few months now.
However, I JUST now (as in 5 minutes ago) realized that you can leave direct comments for people (as opposed to the gallery, which is the only place I knew to look). I have all these comments on my page that I never saw before. Wow, I feel silly!
It makes me wonder what other "treasures" there are on this site that I only thought I knew so well!