Yes, please add Session. Wire is missing, too.
A version of this with usability features would be nice. Some of these I gave earnest tries, with multiple friends who were willing to indulge my interest, and the tools failed for various reasons: too cumbersome, too confusing, too unreliable, too basic. It's a subjective metric, but these are social tools, and to be useful, they have to be usable -- and many simply aren't.
I don't know if it's humorous, but one unexpected thing I discovered was that Wire's and Session's embedded animated GIF finder+inserter is so hugely desireable with my friends, it became an almost minimum requirement. Funny GIFs are immensely popular.