My point though is, you can call Facebook an advertising company, but when asked "What are Facebook's competitors?" as the Senator did, it makes sense to list social networks because that's the core product they offer their users. For the purpose of this discussion it doesn't help to say Facebook is an ad company or "You are the product" or anything else.

There are a ton of ads in Yankee Stadium (and every major sport stadium I can think of, for that matter): https://upload.wikimedia.org/wikipedia/commons/4/44/Yankee_S...