Click on the "Continue as Facebook username" button.
Now, set the privacy option you prefer from the drop-down list and then click "OK" button.
You can see a confirmation popup now. Click the "OK" button on that.
That is all. Your Twitter account is connected to your Facebook profile.
Note: You can uncheck the first option if you don't want retweets to get posted to your Facebook profile and page. Uncheck the second option, if you don't want the tweets to get posted to your Facebook profile.
If you want to connect your Twitter account with your Facebook Page too, then here are the steps (do the above steps if not already before below steps):
Click on "Allow" link (see above screenshot).
You can see a popup now and click "OK" button in that.
Now, you can see this screen.
Under "post to your Facebook page" option, you can see a drop-down list. Open it, and you can find your Facebook pages. Pick the one you want.
That is all. The Twitter account is connected to the Facebook page you choose.
If you want to connect Twitter to the Facebook page only and not to your profile, then you need to do this step (do the above steps if not already before below steps):
Uncheck "post to my Facebook profile" option.
That is all. Your Twitter account is connected to your Facebook page only.
Note: To disconnect, click on "Disconnect" button and that's it.
Connect Facebook to Twitter
The following are the steps to connect the Facebook page to Twitter:
Click "Link my profile to Twitter." Provide your Twitter account credentials and then click on "Authorize app" button.
That is all. Your Facebook profile is connected to Twitter.
Note: If you wish, you can uncheck the one that you do not want to be posted on Twitter and then click on "Save Changes" button.
Also, note that only public posts will be shared with the twitter.
To disconnect Facebook profile from Twitter, visit this URL and then click "Unlink from Twitter" link which you can find under your Facebook profile. Also, go to "Apps" section of your Twitter account and then click on "Revoke access" button beside Facebook.
If you wish, you can connect both Facebook page and profile to Twitter using the above steps.
I hope that this guide is useful to you. If it is, share this guide with your friends.
How to Connect Twitter to Facebook (and Vice Versa)