My take on it is, a social is going with a mate or a couple mates or even meeting a few at the lake, all set up close to each other and you have a get together, food and a few bevvies.
I do find certain types of waters attract a certain type of angler. There's a lake near me that if you ain't in their little circle, you are pretty much ignored. Usually over stocked puddles with big fish. Not my sort of water anyway lol
The reservoir I'm fishing at the moment, everyone I've met has been friendly and helpful. We all share what we've caught, how many wraps, what bait, where any under water snags are etc. Trying to put each other on the fish.