I'm an INFJ and most of the time, I find it really difficult to open up to new people on a personal level. Sometimes it takes me literally years. But every now and then, I meet someone I just "click" with... and by "click" I mean I immediately feel comfortable interacting with them on a personal level.
When I meet people like this, it affects me deeply, and what might be a superficial connection for them is very profound for me. I also tend to want to stay in touch with them, and once or twice have creepily found them and friended them on Facebook because I just can't stand to lose that connection (if it's not someone I'd see frequently again, which usually it isn't because, well... the only people I see often are my family, coworkers, and already-close friends).
Does anyone else experience this? If not, but you found yourself on the receiving end of this strange, premature, possibly one-sided profound attachment, how would you react?