Why you saw swastikas appearing on Twitter accounts everywhere

Thousands of Twitter accounts — including major verified ones like Duke University, Reuters Japan, BBC America, Forbes Magazine and Amnesty International — have been compromised with a swastika and a message in Turkish supporting President Recep Tayyip Erdogan. 

The compromised accounts were under attack likely through their use of Twitter Counter, a third-party service that allows people and companies to track their popularity on the social network.