Questions about Facebook?

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I had a Facebook years ago but never really used it and ended up just deactivating it. I'm toying with the notion of reactivating it, but I have some questions I'd like to ask frequent Facebook users;

1) Prior to deactivating my FB, a sibling of mine tagged me in a photo of myself she posted (a pic I found to be embarrassing). I was horrified when this pic showed up in the news feed for all to see. Is there a setting to make sure this can never happen again? Can I turn off tagging completely?

2) Does FB aid your social life? I basically have no friends living nearby to hang out with and I'm completely isolated. I'm super shy and have a hard time making friends. Do you get invited to social events frequently through FB? Would having a FB increase my chances of having a social life? This is my main interest in having a FB. If the answer is no, then I would rather not bother.