Cyber security firm Trustwave announced on Tuesday that nearly 2 million online accounts have been hacked, compromising the privacy of user of Facebook, Yahoo, Google, Twitter, and payroll service company ADP in nearly 100 countries. According to Trustwave, the violation was likely achieved using keylogging malware, began on October 21, and is possibly ongoing. CNN reports that Trustwave has alerted affected users of the security breach. Trustwave says that roughly 1.58 million website logins, 320,000 email accounts, and several other credentials were stolen.