Let’s face it. Despite the tremendous rise of productivity and organizational tools that computers, then the internet, then mobile devices give us, we sometimes forget things that at one point were important to us. This is where Google and other retargeting services come into play and I love it.
The idea of the NoFollow attribute on links was to help prevent spam from appearing on user generated content sites, particularly Wikipedia. It was intended as a way to tell Google (and eventually all major search engines) that a link was not supposed to transfer any “link juice” to the recipient of the link. In essence, it was designed to stop SEO spammers from trying to insert their links where they didn’t belong for the sake of improved rankings.