To maybe clarify some things :

shipping is when fan communities make a alternative canon where certain characters are matched romantically and a example of this from tumblr is when the fandom for the BBC series Sherlock paired Sherlock with moriaty and watson in fan art and later gave Moriaty a love interest / henchman that only exist within the fandom on tumblr. Fan culture is often disproportionately queer and shipping is to an extend also reaction to a lack of queer representation.

Justgirlythings is a blog that’s run by someone who is currently a out lesbian who started it when she was like 13 and back in day shared a pretty rigid hetro normative idea of what was girly.