I've found it a useful way of interacting with people while I've been on my own for most of this year. It's kept me motivated and given me much needed feedback (sorry if you've not enjoyed my constant witterings
I've got a lot of friends on FB. I know them all as I've been and done a lot of things over the last 44 years, but I also get a lot of friend requests that I just delete or ignore as I have no idea who they are.
Social media is here to stay (for the next few years at least) so you'd best get used to it!