During 2007 there were 1,088 incidents reported over all IM, P2P, and chat vectors. 19 percent of threats were reported on AOL Instant Messenger network, 45 percent on MSN Messenger, 20 percent on Yahoo! Instant Messenger. IRC-distributed attacks: in 2006, IRC accounted for 58 percent of attacks, rising to 72 percent by year-end 2007. Attacks on private networks have more than doubled in share since 2003, rising from seven percent of IM attacks to 15 percent in 2007.”]
Source: https://www.darkreading.com/attacks-breaches/facetime-releases-findings-for-2007