I think that the ‘friendship’ between Hamilton and Button never looked very real. They have also had several controversial moments on the track, such as Turkey 2010 or Canada 2011. Now that Lewis is about to leave the team, he obviously feels free to speak his mind.
The fact that Button never followed Hamilton but follows McLaren and several drivers, including Gary Paffett and Nico Rosberg (and now Sergio Perez as well) probably tells you something about the relationship between both McLaren drivers, too. On the other hand, Heikki Kovalainen doesn’t follow LH either and he’s always said that Lewis is his best mate in F1.
Anyway, Twitter certainly adds a lot to the F1 excitment these days. For example, Alguersuari recently started following Force India (he ain’t following any other team), which is seen as a sign that he is about to join the team for 2013. “Who follows whom in F1″ could be an exciting topic to research.