Riddle: you see all your friends when you're with me. but when you come to me, you look at your own face the most The answer belongs to a non-living thing and commonly seen in houses and offices.
closed as too broad by feelinferrety, Beastly Gerbil, Glorfindel, user58, Peregrine Rook Oct 3 '17 at 20:34
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Guess it is:
All your friends are there, and you can see your own wall.
Maybe this is:
When you wear them, you see everybody. But when you look at them, all you see is your mirrored face on glass.