I have had the facebook tooltip available as a part of my core library for a while now. However, usage on various sites highlighted certain visual errors in the way it rendered on sites with custom CSS settings for line-height and line-spacing. This (plus the ineffectiveness of the old way the tooltip arrow was injected) caused me to sit down and refactor the whole function. Look at the demo tooltip page for possible uses.

It’s just silly and totally unnecessary unless you have some silly amount of applications… For the rest of us who use facebook to keep in touch and play a bit of poker, it just sucks. The sad truth is: they are freeing up space to have more adverts. Not that it matters with firefox anyway!