Twitterr is a fake website/hijack 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. 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 a survey scam most of the time, but sometimes it redirects to a work-from-home scam, a lottery scam, or a search for "Twitter". It is currently unknown what happens in Internet Explorer, Edge, or Opera.