Following the latest spate of Twitter hacks of verified accounts this morning, FastFT has this handy guide to how to protect yourself if you find your own account is targeted.
The best way to protect yourself from a hack like this in future is to change your Twitter password, and revoke access to any third-party analytics apps that plug into your Twitter account, such as Twitter Counter.
To remove access to third party apps, start by signing into your account on twitter.com.
In your account settings, click the Apps tab and you will see a list of all of the applications connected to your account.
Each app (for example, Periscope, Tweetdeck or Twitter Counter) will have specific permissions listed under it, showing which ones are allowed to just read your tweets, versus others that can write Tweets and send direct messages on your behalf, or even access your email address.
To disconnect an app from your Twitter account, click the Revoke Access button next to the application.