How to Know If Your Twitter Account Has Been Hacked
If you've logged onto your Twitter account using your password, but your setting aren't the way you left them, your account may have been compromised.
Step 1: Look for tweets you didn't post Look for any tweets from your Twitter account that you didn't post. Hacked accounts may post unwanted tweets to your followers.
Step 2: Check your direct messages Go to your direct messages and click on the Sent tab. Look for any messages from your Twitter account that you did not send.
Step 3: Look for unapproved behaviors See if your Twitter account has you following, unfollowing, or blocking people, or any other account behaviors that you did not set up.
Step 4: Check e-mail Check your e-mail account. Did you get a notification from Twitter that you changed the e-mail address on your account when you haven't changed it? This would indicate that your account has been hacked.
Step 5: Remember if you gave away your password Think about if you gave your password to third-party sites or applications. If you gave your password to a malicious third-party, there is a good chance your account has been hacked.
TIP: Know that Twitter will never e-mail you asking for your password.
Step 6: Correct the problem Correct the problem. Change your password. Go to your Account Settings and click the Connections tab. Revoke access for any third-party applications you don't want. Follow the safe tweeting suggestions provided by Twitter to keep your account protected in the future.
FACT: In 2010, the United States Library of Congress began archiving all the tweets on Twitter as part of the historical record of technology based social networks.