Facebook, the government, and freedom of speech

I just read an article on CNN (http://money.cnn.com/2016/05/10/technology/facebook-news-senate/index.html?iid=ob_homepage_tech_pool) where a senator, John Thune, in South Dakota is demanding (I thought the government was to serve the people, not to be their master) to know who is approving trending topics on Facebook. Once again, the government oversteps boundaries. It's none of their business. Why are we wasting taxpayer dollars on someone who puts their nose in other peoples business? I get Facebook for free. It's very valuable and provides an amazing ability to connect with friends around the world. If they want to...