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But, how do you know if someone is making strong eyecontact, or glaring? Usually these things happen to fast for me to recognize! I try to make eye contact a lot, but then I worry I am staring :S
I did not especially mean strong eye contact. What I meant is; when you glance at someone and their eyes meet yours; then smile, then relax your mouth & glance away.
Whether the other person is making brief eye contact or glaring, smiling in response is OK.