show a rolodex-style bigass list of people's names
Searching is helpful, but the other key activity I'd like to do across social networks is skimming. If I want to invite people to a party, or send out a ping to a bunch of friends that I'm looking for a job, I'd love to be able to do that across networks.
So I'd like a simple alphabetized listing of names that I can skim, and ideally a way to tag people into contact groups so I can have, say, a "brunch invite" list that includes all of them.
From there, it might be nice to be able to directly reach out to them, by sending an email or setting up a facebook event or, maybe someday, filling out a single invitation form that then generates the appropriate notifications on whatever social network each person prefers (kinda like http://gigblastr.com/ ).
But just being able to make a list and get consolidated contact info for those people would be pretty handy.