Want to link your Twitter account to Facebook so that your status updates sync? Easy, here’s how:
Step 1: Search for “Twitter” in Facebook’s search field.
Step 2: The first result should be the one you are looking for. It is the application “Twitter.” Click “view application”
Step 3: Add the Twitter Facebook Application.
Step 4: Choose your settings and add the Twitter Facebook Application to your profile.
Step 5: Enter your Twitter login information.
Step 6: Choose to have Twitter update your Facebook status.
Step 7: Allow and Authorize Access for Twitter to Facebook.
Step 8: That’s it! Now every time you update your Twitter, your Facebook status will update automatically.
Taken from AJ Vaynerchuk’s Tutorial