Social networking service Twitter has said it was confident that recent reports of Twitter servers being breached were not true and that details released were from other hacked websites. Certain accounts have been identified by Twitter for extra protection and thereby told to change passwords as a protective measure. Security officer Michael Coates has said that what was being proclaimed as hacked Twitter names and passwords may have been amassed from combining information from other recent breaches, malware on victim machines that are stealing passwords for all sites, or a combination of both.”]
Source: https://www.darkreading.com/cloud/twitter-says-its-servers-were-not-breached