I can't, for the life of me, find the right words for the thing I'm searching for, which makes it even harder for me to find it on Google. I'm looking for some kind of plugin which will let me add a popup on the right (or left) of the browser's window, where I can show a link to other post or other site. The popup will follow the users movement so it'll almost always be on the bottom-right of the browser. You might have seen some of these on news/magazine sites, saying such as "You might also like...". But I can't find it anywhere and I'm pretty sure I'm searching for the wrong terms.