Social networking: Google Plus
Or, more correctly, "Google +" - now released in beta.
It has some interesting features, and I predict we will see some people defect from Facebook and others add it as their truly private social network (I think many folks are going to keep FB for some time because it is, right now, the town square of the Web. PC World has a good rundown.
I definitely can see this catching on with my students.
However, the Financial Times does point out the "resharing" feature
could be a privacy hole (you can apparently turn that off, but not easily)
Computerworld suggests that with a little tweaking to work with Google Docs, this could be a solution for collaboration within organizations (certainly would have to be better than the ill-fated Google Wave).
So this will be one more thing newsrooms will have to think about - and it reinforces the management challenges. It's so much easier when you have a Facebook that gives you "one stop shopping" to reach an audience, but it's not going to be that way anymore. It's going to take serious thought about where your audience is and how to reach them - not just mindless, robotic distribution.