No it's fine as long as she knows your name you should be good. If you've never talked at least introduce yourself first. Go to her and find an excuse to talk then add her later.
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When I am bored and want know new people I do exactly this. Is it weird? I don't know but none complain about it.If you are loged on your gf Facebook , then you should ask her first.
Yes, that's very weird.
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