It was introduced on 1st of April and was definitely on the frontpage for few days. They also have a blog post [1] about it. [1] http://www.redditblog.com/201

It was introduced on 1st of April and was definitely on the frontpage for few days. They also have a blog post [1] about it. [1] http://www.redditblog.com/2015/04/the-button.html http://www.redditblog.com/2015/04/the-button.html