Political Echo Chamber

Congress' laws only apply in America.

The Internet is global.

No, Congress doesn't have any authority over how FB interacts with its customers. FB is no different in this respect than Fox News or MSNBC.

engineer and izzythepush-

Thank you. I'm not convinced that you are wrong. I don't know the correct answer.

I believe that Facebook is incorporated in one of the 50 States (e.g., Delaware), based in a U.S. city, operated largely out of U.S. locations, and employing largely U.S. citizens and residents. I believe that one or more of these attributes make it subject to U.S. law.

But Congress is subject to the Constitution. FB has rights as do their users. If their users choose to associate with those of similar views the government can't prevent them. Both speech and association are protected by the first amendment.