Per the New York Times:

• Google controls 88 percent of search advertising
• Facebook, which also owns Instragram, WhatsApp and Messenger, controls 77 percent of social traffic
• Amazon controls 74 percent of e-book market

What to watch for: we are seeing more chatter than ever that these companies are getting too big too fast. Americans retain a romantic view of big tech firms but concerns about fake news, privacy and consumer choice are rising.