Rockmelt Stats In the Months Before They Were Acquired by Yahoo

This is pretty useless for month over month change since it only goes back one or two months in a several year story. If mattermark had stats from 2009 onward on this company, it would be really really interesting now.

Agree with rdl about the amount of history, although that's just a matter of time before you have more history on startups that are getting acquired, which is going to be really cool.

For Facebook/Twitter/LinkedIn it's probably more interesting to see likes and tweets (or some other sort of interaction score, like Klout) instead of just pure followers. Since followers are going to be pretty slowly climbing all the time. (Although maybe in larger time intervals followers would be more interesting.)

Annotations of events for the companies on the graphs (Google Finance style) would also be sweet, so they are easier to parse for outsiders.