Are sites like vox or gawker considered websites or web apps? Their custom CMS is quite expansive. How bout NYTimes? Is YouTube a web app or a web site? I'd be

Are sites like vox or gawker considered websites or web apps? Their custom CMS is quite expansive. How bout NYTimes? Is YouTube a web app or a web site? I'd be curious to know some examples on either side. Preferably several closer to the line but on one side or the other rather than far away.