Well, it seems Facebook just wasn't cool enough for the aspiring Ph.D... Heard of Epernicus? According to the tagline, it's 'Where Science Meets.' Only you have to be invited. In fact, you must 'use the name under which you publish, if applicable', so the webhosts can review your request and determine whether you're worthy of an invitation. The idea is simple. A social networking site to connect with others in your field and share information on research, honors, pedigree, and publications. There's even a blog. I can see this being useful.
Of course, profile photos, chat, and email features make me suspect it can also conveniently aid early career scientists in pursuit of romance. Gosh, I mean, if I found a mister as interested in cucumaria frondosa as me... well, err, no nevermind. But heck, I'm a poor sample size and not so into online dating. Anyway, interested folks can go request invitations and find out if they make the cut! Elitist, you ask? Well, I mean come now--they don't call em the ivory towers for nothing.