What's wrong with someone caring about my involvement only superficially? It doesn't mean I don't want to be involved. Let's talk parties: sure, if a friend I see regularly is having a party, I'll get invited whether I'm on Facebook or not. If it's a more tangential connection I don't see very often just spam inviting their friends list, they might not even have other contact details for me, but it'll still probably be a fun event that I'd like to go to, and if I'm not on FB then I miss out.