Twitter is discontinuing its free API; here’s what will go wrong

If you’ve ever signed into another service using your Twitter credentials, the upcoming API shutdown may prohibit you from accessing your account. It means you should double-check whatever services you’ve used Twitter to login to, and alter your account information while you can.

Settings -> Security and Account Access -> Apps and Sessions -> Connected Apps allows you to see which services have access to your Twitter account (or, clicking here). Depending on the service, you may need to establish a new account with new credentials.

Nuke your tweets