What sort of Account ?
iChat 6 in Lion can accept AIM names including Apple registered IDs (@mac.com, @me.com and @icloud.com)
Jabber names which include Google talk and Facebook.
and Yahoo IDs
You list OS X 10.8.2 as well and this has iMessages as well as the ones above.
iMessages can accept one Apple ID at a time.
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously