"Props to 4Sq for adding likes, and this gives me an excuse for exploring some related themes: First off, let me say that simple stuff works. In many cases a simple like is all you need. Do think that photo of a cat is cute? Like it. Do you agree with that comment? Like it. In other words: simple emotion => simple reaction. But what if you don't like something? (Hence the Disqus down vote). And more importantly what if you have powerful or complex emotions around something? Just seen Schindler's list? Does a 'like' capture all you want to express? Just finished a three week cruise of the Nile on a wooden raft? Ditto. The obvious answer is to allow people to type-in their more complex opinions, but people generally prefer pressing buttons to typing (especially on mobile). So, how do we solve this problem? Is it worth solving?" - David Semeria