Yuri anime is showing no signs of stopping in the past several years, but mainstream /ll/ seems to be pretty recent.
EDIT: Due to a poor mis-tag I made, I unintentionally rendered the image unviewable to regular members. I have no way of undoing the action, so any mod that sees the "loli" tag, I apologize for it and humbly request its removal. The content isn't risqué enough to warrant hiding.