[MartinCron]

Exactly, I had one of the best discussions about race, class, and privilege I've ever had on Facebook.

But not all conversations need hardcore gravitas to be valuable. There's actually a lot of information in a "cool stuff" RT. It says that the person read your status, and liked it enough to share, that tells you a lot about where your tastes align, which has been a facet of friendship as long as humans have been making friends.