Flxt.it is a simple tool that uses Twilio to manage Netflix queues by sending text messages with movie titles, allowing users to add movies to their queue without needing a smartphone or computer. When a user sends a text message to Flxt.it's phone number, the received information is sent to the web application, which looks up the user's Netflix account information and adds the movie to their queue. The implementation uses ASP.NET MVC 3, Twilio's SMS service, and custom error handling mechanisms to ensure security and privacy.