Isn't that what many people and groups on Facebook have done? Why feed that mentality?
People who will only communicate with you through Facebook are likely not worth communicating with, as that signals that they don't think you're worth the extra effort. Email and telephone are still quite valid and effective means of communication.
"People who will only communicate with you through Facebook are likely not worth communicating with"
Really? You're suggesting I cut people out of my life who want to communicate via Facebook over other mediums? Pretty harsh.
True. But I think Facebook's usefulness is outweighed by its disadvantages. It's an ever-watching anxiety machine: look at this latest atrocious news story, react to the asinine post an acquaintance has made about their life, respond to this event, post more because you haven't in a little while, watch this video about somebody having a life better than yours (or somebody having a horrible time, which may also happen to you, so watch out!), share your contact information for others so we may increase the webbing to keep you in our walled garden!
It's a need machine. It's the worst enabler-friend. It's not in a symbiotic relationship with you; it's parasitic. And IMO Facebook doesn't improve ones life; it merely facilitates using Facebook more and more often to do things that otherwise we either wouldn't do or wouldn't consider a real hassle.
My wife, who is still on Facebook uses it as a tool to coordinate social events, message teachers, stay in touch with family and even ask useful questions to specific groups. You can't force everyone in your life to communicate on your terms, unless you want to A) piss people off and B) reduce your socialization dramatically. If I didn't have her, I'd probably be forced to be on Facebook, if only to support my kids social activities, and stay in touch with my immediate family.
Some content shared on Facebook still annoys her - stay-at-home moms posting about their purchases and political posts are her least favorite - but I have those same issues on Twitter and remain because she and I derive value from the service(s) despite this.