[vsbuffalo]

This isn't the most useful statistical figure. The heart feature is novel — the increase could be due entirely to folks trying it out. A more meaningful figure would be to look at the folks who have constant favoriting habits (with stars that is) and see how their behavior changed. Personally, I'm more reluctant to heart tweets, as my Twitter account is mostly professional and it feels a bit unprofessional to "heart" a colleague's tweet.