This appears to be a link shortener service provided by "click to tweet dot com", which prefills some information into a Tweet for you to tweet at the author. I

This appears to be a link shortener service provided by "click to tweet dot com", which prefills some information into a Tweet for you to tweet at the author. It seems to be a convenience thing. Chances are your antivirus software is a little over-cautious and some malware has at some point used the link shortener.