Given how Twitter lends itself to frequent posting, the optional feature that posts every tweet to Facebook can lead to an excessive stream of Facebook updates. To stop the cross-posting, disable the link through your Twitter settings. To erase every tweet from Facebook as well, remove Twitter from Facebook's settings as well.
Disconnect Without Deleting Tweets on Facebook
Log in to Twitter, click your profile image on the menu bar and choose Settings.
Open the Apps tab and click Login to Facebook. Log in using your Facebook account.
Uncheck Post Retweets to Facebook to cut back on Facebook posts by only sharing your original tweets.
To turn off all posts, uncheck Post to My Facebook Profile to stop posting personal Facebook status updates. Uncheck Post to My Facebook Page to stop posting to the Facebook Page for your organization or company.
Press Disconnect to completely remove the link between Twitter and Facebook. No further warning appears after pressing the button -- if you want to use Twitter on Facebook again, you'll need to click Connect to Facebook to reconnect.
Disconnect and Delete Tweets on Facebook
Log in to Facebook, open the menu and click Settings.
Open the Apps page and click the X icon next to Twitter.
Check the Delete option and press Remove to delete all of your tweets from Facebook and disconnect the two services. There's no way to undo deleting your posts on Facebook, but the tweets remain on your Twitter account.
Click the "Edit" icon for Twitter on Facebook's Apps page to change the audience for your tweets, if you want to keep posting tweets but show them to fewer people.
Deleting an individual tweet from your Twitter account won't erase it from Facebook. Similarly, erasing a Facebook post that originated from Twitter won't erase the original tweet.