I use to keep a cookie that was only used client side with the previous pages the visitor visited. It grew a menu in the side bar. I never got around to it but

I use to keep a cookie that was only used client side with the previous pages the visitor visited. It grew a menu in the side bar. I never got around to it but it could be interesting to generate a tiny tag cloud for the visited pages and say 3 article suggestions based on those. I didn't build it because the "visited = interesting content" doesn't seem real to me. Its more of a top 10 of click bate headlines.