I'd like to point out that it's also there for the owner's own convenience as well. It's likely that we will implement the feature to remove it when people view your work but it will probably stay there for the owner of the content.
I like this idea. I also like the idea of stats to see where -- if at all -- our stuff has been shared (if not for everyone, maybe as a "pro" feature?). And for those who don't have a problem with sharing in general, but want more of a say-so over where certain pieces get shared, I think a check-off menu with a list of sites is best (if that makes sense).
I also love that the admins here are willing to listen and talk it out with the membership. (glares at other corners of the internets...)





