How I feel about it:
Very annoying - more than 1 notice for the same stream session (e.g. "I'm STILL streaming! Come on in!" after they'd already posted a link)
Also annoying - way more streams/ notices than actual comic updates.
Not my bag of tea, but understandable - occasional streams
If I could turn off all stream notices on Tapastic, I would do that in a heartbeat. Creators I'm interested in watching, chances are I'm already subbed to them on Picarto. Getting notified more than once for the same thing (e.g. on Tapastic and Picarto) really annoys me. It's not really the creator's fault, though.
What IS the creator's fault... is when people make wall post notifications about their comic update. Look, I already got that notification in the other feed!!!