I don't think many people will want to give out much personal information here. You'll probably just get a load of fake accounts addign you to pump up their friends, though I'm sure you wouldn't be bothered too much by this
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I also think so
Generally, I don't think that is good idea invite total strangers for friends, it's better start slowly, interact on some public forum or skype room and after you get to know somebody invite him/her in your social network.
i will do like this but I guess you already decided.