Whoa, I had an idea creating something like that in 2011. And I thought "it's stupid, noone would use it except me" and "google or yahoo would probably build a

Whoa, I had an idea creating something like that in 2011. And I thought "it's stupid, noone would use it except me" and "google or yahoo would probably build a much better one and have 10x more engineers iterating on it". Which brings me to the point: Why did Yahoo buy this, instead of building it themselves? Are they really that thin with engineering talent?