Researchers at Symantec have discovered a trojan that uses Facebook to communicate with a control and command server. Dubbed whitewell this malware spreads via email, contacts the mobile version of Facebook and uses its Notes section to perform actions based on the Notes titles. The trojan is not using flaws or exploits, but standard Facebook functionality in a targeted attack. Both Super Mario Bros . and GTA 3 Moscow City racked up 50,000 to 100,000 downloads.
Source: https://threatpost.com/researchers-find-trojan-using-facebook-110309/72996/