Why does China feel Facebook to be a threat to their national security?

This is certainly an indicator of the situation with China. Facebook puts a lot of power in the hands of the people. This is something that China doesn't want as the Communist party wants to hold complete and ultimate power within their nation. No other group or person is allowed to have power outside of the power of the nation.

The amount of connections that Facebook can give to a person is a fearful matter for the Chinese Government. Facebook will allow people to express their opinions and broadcast it to a large group of people. If this is allowed, people who oppose the government can open up accounts and spread information to overpower the Chinese Communist government that wants supreme authority.