User KingTreehouse (also known as Gucci Goth and Blackblackgold) starts tagging bands on Last.fm with witch house label. Among the first bands tagged are Salem, Tearist, White Ring, Winter Drones, Modern Witch, oOoOO, Pictureplane, Clapsclap, Zola Jesus, Mater Suspiria Vision, whatfunnybirdsdiveintowater, GR†LLGR†LL, and Sleep ∞ Over.
https://www.last.fm/user/KingTreehouse/tags/witch+house
Full list of tags and dates when they were added (in order):
Salem
28 Jan 2010, 6:40am
Tearist
28 Jan 2010, 6:40am
White Ring
28 Jan 2010, 6:40am
Winter Drones
28 Jan 2010, 6:41am
Modern Witch
28 Jan 2010, 6:41am
oOoOO
28 Jan 2010, 6:42am
Pictureplane
28 Jan 2010, 6:47am
Clapsclap
28 Jan 2010, 6:48am
Zola Jesus
28 Jan 2010, 6:49am
Mater Suspiria Vision
28 Jan 2010, 6:51am
whatfunnybirdsdiveintowater
28 Jan 2010, 8:43pm
Gr†LLGR†LL
28 Jan 2010, 8:46pm
Sleep ∞ Over
29 Jan 2010, 8:15am
Balam Acab
17 Feb 2010, 1:57pm
Ghetto Caviar
18 Feb 2010, 2:22pm
tmtmtmby
18 Feb 2010, 2:23pm
///▲▲▲\\\
1 Mar 2010, 8:49pm
dir†ypride
24 Mar 2010, 5:12pm
Fubu Mane
21 Apr 2010, 10:49pm
Fostercare
28 Apr 2010, 7:27am
Rihanna
31 Jul 2010, 3:17am
Creep
6 Sep 2010, 8:07pm