Apple, Google, Amazon and Facebook are, in some ways, more powerful than our federal government. The tech giants decide what information we see - and what we don't. Their decisions can close down whole industries. For many years, they stuck to sunny California. But today they're a huge presence in the Washington swamp, spending millions to make sure legislation goes their way, providing a lucrative revolving door between industry and government. And they're even secretly funding lapdog professors to make their arguments for them.