One ENFP I knew who was incredibly needy, and who ditched me very unequivocally as a friend ("fuck off, I never want anything to do with you again!" were her words) several months ago, because I found myself unable to share all my inmost thoughts with her after having known her for a whole six weeks, used to use Facebook to gain leverage/presence in my life. After she ditched me (at which I was, frankly, relieved), she blocked me from her Facebook, and not long afterwards I deleted my account for totally separate reasons (family plots and feuds, just had enough of them).
Just last night I created a brand new account, using my middle name and putting all my profile in French. I began to add some of my friends from the previous account. I had one friend in common with her, and by this morning I got an FB message from her saying "I just wondered if you knew this person, it seems a bit of a coincidence that you have the same surname and write in French, and he knew French, and you have all the same friends as me".
Now, why would she do that? Doesn't that seem crazy/neurotic/stalky? Why would she care to check up when she'd declared herself that she wanted no more dealings with me? Why would she say "all the same friends" when there's only one in common? What was she planning to do if I had replied "yes, it's me, I'm the same person"???
I realise this is probably more a "crazy person" thing than an ENFP thing, but I thought I'd add it, anyway, cos it is a sort of extreme version of behaviour patterns I have noted in other ENFP's, to a less extreme degree