There are already applications which do this, or things like it. There's a social network based on Dropbox called Frenzy[1], which seems to do most of the thing

There are already applications which do this, or things like it. There's a social network based on Dropbox called Frenzy[1], which seems to do most of the things that your proposed DropChannels would do, and plenty of applications that automatically upload stuff into Dropbox, or use it to keep in sync across computers. [1] http://frenzyapp.com/ http://frenzyapp.com/