Two pages of notes sitting in a binder in front of Mark Zuckerberg during his congressional testimony this week hinted at a message the Facebook chief executive rarely got a chance to deliver: We’re not the only ones.
Mr. Zuckerberg was prepared to say that his company accounts for just a slice of the $650 billion advertising market and that it has plenty of competitors. Google, for example, has an online advertising business more than twice the size of Facebook’s. And Google also collects vast amounts of information about the people who use its online services.
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