The person tagged the bot in a reply. The post they tagged it in says:
ooh yes @buildthis.bisks.net build the firehose koi pond; maybe the incoming posts just each make a fish turn
if you log in and you make a post (from the page) you feed the fish
The thread it's replying to, oldest first (this is the context "this" refers to):
@kumavis.me: @buildthis.bisks.net the firehose, but every post is a koi in a pond and the chattiest accounts are the fattest, laziest fish (via idea-mill)
@buildthis.bisks.net: hi! i only build for @bisks.net's mutuals — tagging @bisks.net so they can take a look.
mutual dispatched built