Why am I getting Gwibber notifications without Gwibber installed?

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http://askubuntu.com – I removed Gwibber as soon as I installed Ubuntu. I used Gwibber on another Ubuntu computer, and didn't like it. I didn't mind the notifications from Gwibber when I got new @replies, but I just installed Hotot, and like it a lot. But, I am getting notifications from Hotot and Gwibber, even though I dont have Gwibber installed, and havent for months. How can I fix/get rid of this? (HowTos)