I had only one experience with Facebook. Joined because of an old friend. She had a cousin who I met once, and whose main goal in life seemed to be to set the record for number of "friends" she had on Facebook. I got caught up in a network that grew exponentially. I just closed the account, rather than "unfriend" her (the cousin). There might have been a way to block her posts without unfriending her, IDK. But the stuff they posted was not at all interesting to me. Almost all about their families who were complete strangers to me.