Did you know that it isn't just unlikely animal pairings that can be best friends?

Turns out human animals can be best friends, too!  June 8 is National Best Friends Day, and what better way to express your feelings about your best friends than logging onto a faceless computer and typing into a void? 

Whether you have had a besty since childhood or you respond to the texts you get from Seamless, here are the 21 best tweets about being BFFs.