​Google announced a change to the nofollow link attribute yesterday and with that announcement, Googlers spent the next day responding to questions about it on Twitter. I will go through what changed according to the announcement and then cover almost all of the responses from Google (removing duplicates) so you get a full perspective of this change. Nofollow is an HTML attribute that is added to links. It tells Google that a link is not trusted. It was originally designed to combat blog comment spam. It evolved for use on advertising links and for user generated links that couldn’t be 100% trusted. Google’s systems cannot verify the accuracy of content; instead, it relies on signals that the company thinks aligns with “relevancy of topic and authority,” according to Danny Sullivan, Google’s search liaison, in a tweet posted from his personal account on September 9. This attracted attention from SEOs and kicked off a conversation.​