What a horrible thing to wake up and have this at the top of your aggregator, see the story collected (Wikipedia is the best source during a disaster) and look for check-ins from people you know. I can only admire the resolve of Londoners and wish them peace.
If you haven't tried Wikipedia Animate, winner of waxy's contest, point it at the Wikipedia page and sit back. You'll find early edits such as "Nobody knows what's going on WHOLY SHIT!!!!?~!!111!11!" evolve with thousands of edits into collective understanding.