Facebook might not have joined the blackout to protest against SOPA but Mark Zuckerberg has clearly said that the company does not support it.
He said in a note on his Facebook page:
The internet is the most powerful tool we have for creating a more open and connected world. We can’t let poorly thought out laws get in the way of the internet’s development. Facebook opposes SOPA and PIPA, and we will continue to oppose any laws that will hurt the internet.
The world today needs political leaders who are pro-internet. We have been working with many of these folks for months on better alternatives to these current proposals. I encourage you to learn more about these issues and tell your congressmen that you want them to be pro-internet.
It would have been amazing if Facebook had blacked out for a day. The service is used by more than 500 million people on a daily basis. That is five times the number that Wikipedia estimated would see their SOPA boycott message today.