There's no way of sharing emblems. At least not yet. However, i'd rather not have a system that enables emblem sharing.
I'd hate to be spammed with emblems showing nudity and other negative crap.
Would be nice with a way to look at other player's emblems via their player cards, and rate them however. I still haven't found a way to do so, might be that i'm just not looking in the right place perhaps.