The Twitter Counter App used with Twitter accounts appears to have been compromised and has been used to post spam messages to users' feeds. The messages are written in Turkish and appear to target Holland. Twitter accounts for Amnesty International, Forbes and any other users with high post and follower counts seem to have been targeted. The company Twitter Counter have acknowledged the breach of their service and taken steps to secure it, however the breach appears to mirror an earlier one from November 2016.
Twitter account holders who made use of Twitter Counter should revoke access for it in line with Twitters instructions.
Whilst Twitter account details should not have been compromised, in the event of any connected breach it is good practice to review the security of all Twitter accounts and make sure they:
- have a new strong password
- ensure that any mobile phone numbers associated with the account are current
- use login verification where possible
- review the access for third party Apps and revoke those that aren’t needed
More advice is available from Twitter on Account Security tips - https://support.twitter.com/articles/76036#