I am not affiliated in any way with the following sites. I am just linking them for your convenience.
If you have a site you wish to have linked here, email me a link. If you do not supply a 100 x 35 button, I will make my own.
Here is a list of the Harry Potter slash communities I belong to on LiveJournal. Obviously, it is not a complete listing of all communities, as there are far too many to list! If you are a member or moderator of a Harry Potter community, and want it listed, let me know.
Multi-Pairing Communities:
hp_adult
hp_fanfiction
hp_one_love
hp_squick
hpsmut
hpvamp
pornish_pixies
Harry x Draco Communities:
_drarry
accio_hd_fics
blackmyeye___hd
harrydraco
hd_angst
hd_complete
Weasleycest Communities:
weasleycest
Albus Severus x Scorpius Communities:
hp_ass100
scorpialbus
the_ass_ship