You can read more about SOPA and PIPA from Wikipedia or Google.
If you agree- and want to show your support (after contacting congress and signing online petitions) — censor your FB profile picture!
Here’s how in Windows–
Download your current profile picture, and save to your desktop. Then go to Start > Programs > Accessories > Paint
Open your profile picture
Click the Rectangle button
Click on Color 1, then click Black
Click on Color 2, then click Black
Draw a box over your eyes, and eyes of others in your picture.
Do a save-as, and rename it.
Upload to facebook, and tag yourself.
Add a comment or two below the picture to explain what is going on, and why you are censoring your picture
If you want to get fancy, you can use GIMP or Photoshop to rotate your censor box, and add a nice drop shadow. But the Paint trick gets the job done fast too!