What about Trip Advisor? They seem like some sort of pariah in this space. Hardly anyone talks about them, but despite their un-hipness, we've come to rely on t

What about Trip Advisor? They seem like some sort of pariah in this space. Hardly anyone talks about them, but despite their un-hipness, we've come to rely on them as our primary source of information when traveling. We regularly find more reviews on Trip Advisor than Yelp. I don't understand why Yelp gets all the attention?