Sure, any bot running on IRC (e.g. Eliza or A.L.I.C.E.) could run via Bitlbee (IRC to IM gateway originally a fork of Gaim/Pidgin) on other networks such as ICQ

Sure, any bot running on IRC (e.g. Eliza or A.L.I.C.E.) could run via Bitlbee (IRC to IM gateway originally a fork of Gaim/Pidgin) on other networks such as ICQ. There was also e.g. Licq which could spoof UIN and message, as well as that it had plugins for bots. I also had a friend who ran a sexbot called jenny on DALnet (not the IRC network with the most clever population). Fun times!