Wordpress is good if you need posts/blog-like site, but if you're going to scale up to something really huge like Groupon did, you'd be better off with a custom

Wordpress is good if you need posts/blog-like site, but if you're going to scale up to something really huge like Groupon did, you'd be better off with a custom framework w/ full control, better caching, etc. -- Wordpress is a hog on resources, and very easily hacked as well. My laravel sites all perform light years better/faster.