According to TechCrunch, Twitter has plans to abandon Ruby on Rails after two years of scalability issues --
http://www.techcrunch.com/2008/05/01/twitter-said-to-be-abandoning-ruby-on-rails/ For those who are unaware of what twitter is It's a micro-blogging service, in other words a service to announce to your friends what you're having for dinner, how satisfying your bowel movements are, and whether or not you intend to see the hip concert that is happening next week in your neighborhood. It's the blog without the content, the conversation without the words, the letter to a friend without the feeling.
But seriously, ruby is ugly. Really ugly. So amazingly stupidly ugly. It's so ugly, that "ugly" is complaining about being called ruby. And really how much effort does it takes to store usernames, passwords, and phone numbers in a database, then associate them with messages no more than 120 characters in length. Hell I could slap it together with an access or MSDE database and an asp front end with out scalability issues.