The How-to Portion:

Click here to access the official Star Wars Facebook page and view the lightsaber post Click ‘Try it’ Position your filter and profile picture Set an expiry date for the filter Click ‘use as profile picture’ That’s it you’re good to go. May the Force be with you.

I tried it on my profile too, and here it is

How to add Star Wars Light Saber to your Facebook profile picture   TechWorm - 73