Let me ask you this. What do you do when a friend says they are on MySpace? That is exactly how I see my friends On Facebook after I make the switch to G+ over the next few months. I will still log into Facebook to see what is going on, but for the most part I am only keeping my Facebook account because I admin several pages. For now I am double posting things to FB and G+, but eventually I will stop. IMO, G+ is another social platform, just like Facebook was when there was already Friendster and MySpace. Some people with jump ship, some people will keep both accounts.