Any social site that allows porn?

I'm sure there are

I remember hearing about a site for pornography similar to a scream: spankwire.com
Maybe post your question in a forum dedicated to topics with topics for adults (such as gfy.com).
Otherwise, a Google search appears MANY:

Search: social bookmarking sites for porn

Are you looking for a way to promote the anime site in your firm? Maybe I'll do a more specific search, one that includes anime, instead of a general search of pornographic sites. Otherwise, you will get too many unrelated results.