I use both. I personally think I have gained more important relations and friendships with my fellow regular forum users. We've grown and gained experience together. I've met a few of them in person as well from finding them here. And through my regular posts, people get to know me as well.
Everyone on the the BP Facebook pages aren't as personal in my opinion. And the BP Breeder's Facebook page in particular are really aggressive folks who don't want to help newbies and have a 'breeders only club' mentality.
I'd like to think I'm pretty experienced, but I'm never finished learning new things. And I find that the forum is a very amazing education tool on top of finding those relationships.
Facebook is great for finding fellow reptile enthusiasts and connecting to folks, but actually talking to and befriending them on a personal level is a totally different thing. It's a little more difficult to do that without looking like a creeper in my opinion.
(And that's not counting me befriending my forum friends on facebook.)
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