I'm still getting used to the system as being integrated into a forum, but I generally know the deal.
I suppose I tend to accept every request without really ever looking into why, though most of them are from people I spoke with or carry conversations with. I figure if there wasn't a good reason, they probably wouldn't've sent it. Seeing as I'm also still new here, I don't quite feel like I'm in a position to start sending them off, either. I'm still pretty nervous, though I'm getting more comfortable as the days pass.
So in short, as of now I'll accept anybody, though I'll question it if I have no idea why the request was sent, and I won't send any off right now due to shyness and general unfamiliarity.