I'm primarily on Trisphee, but will pop in daily to check for pings or messages on Pantheon as well.
And also try to post a couple times a week on Zantarni, though I'm bad about checking there.
All those are with the same username as here (sometimes without spaces depending on the site).

And I'm kind of on Subeta as RainbowCat, though I'm not super active in the forums there, outside of events.