I don't think more proof is in order. Rattlesnakes are social. It's easy to see how this is true. This could help with researching for den sites, and many other things I am not even educated enough to imagine. But it doesn't mean ALL snakes are social. We have all certaintly known Garters are "social" in a way but that doesn't mean ball pythons are.
I'd like to see some research into WHY they would have developed these attachments/social skills, as they certaintly don't need them to survive on an idividual basis.