Recent reports have people taking advantage of internet accounts of people to make money, this is done by hacking through one account and contacting all in the address book as a sort of scam.
This is a regular occurrence for those who passwords provide by a service or something that could easily be cracked by external parties through access of personal information.
Experts suggest a change of password frequently or if not, then a different password for every site that is not related to personal aspects of your life as well as sequential. Login verification is also advised as well as privacy setting and mobile security software.
Source: The Guardian