That's why I wrote "for reference". jQuery, of course, is a different kind of library. A proper argument would be: jQuery has about three times the contributor

That's why I wrote "for reference". jQuery, of course, is a different kind of library. A proper argument would be: jQuery has about three times the contributors that mootools has. If I had to decide between mootools and jQuery, I'd pick the second because of that metric alone, yes. (And this is how the market ended up playing out.) Angular (born Jan 2010) has 2.5 times the number of contributors of ember (born Apr 2011), 5 times of React (born May 2013). I'm not just trying to find a reason to dismiss React and I do realize that it is still young. From a business standpoint, though, the choice couldn't possibly be any clearer. I do agree that React has gathered a sizable crowd in a short time and it's definitely on my list of projects that I keep an eye on. But it's simply too young to warrant the same kind of investment that I have personally made into Angular.