You're probably aware by now of the horrendous massacre at Virginia Tech today - more than 33 people killed in a gun rampage by a spurned boyfriend.
Obviously social sites - particularly Facebook and MySpace, have become meeting points for those affected. For those not in the Virginia Tech network, there are a few hundred Facebook groups you can join, many of them with thousands of members. These groups are becoming the main way for students to express their condolences.
For other updates from social sites, see also Wikipedia, this Twitter stream, this entry from a student on LiveJournal and the cellphone footage below, taken from Liveleak. What more can you say? Just a horrific event. Perhaps it's even wrong to put a social spin on it: I don't know.