Finally, Twitter makes a little bit of sense to me.

http://twitchy.com/2013/04/19/watertown-mass-area-carjacking-related-to-mit-shooting-police-chase-underway-explosions-heard/

That's a searchable crowd-sourced liveblog of what went on last night, in Boston, during the manhunt.

I don't know how to search it and refine such strings, but it's fascinating.

Note: there will be lots of false flags taken from such unverified reports, in which people will declare that one "fact" was known, but now the story is different.