Twitterr is a fake website/browser hijacker website that lures off of typosquatting. Firstly, it locks the window so that the user is unable to close it. It then claims that the browser is infected with malware, and the website displays an error with a flashing background, causing users with photosensitive epilepsy to gain seizures. A few minutes later, it then crashes all of the user's add-ons.
The website flashes white to black quickly, thus people with epilepsy should be careful when typing.
The message also appears to be a fake message from Xfinity/Comcast.
This browser hijacking website only works on Google Chrome. On Firefox, the website redirects to Facebook's sign up site. On Safari, it redirects to edmunds.com. Internet Explorer (IE11 on Windows 8.1) doesn't connect to the server at all. Microsoft Edge will simply deny connection and will say it can't reach the page. It is currently unknown what happens in Opera.