Alex_TJ - 8:06 pm on Mar 11, 2013 (gmt 0)
No libraries - I like to keep things lean and fast. Even our sprite is a base64 data image :)
The site is pretty heavily optimised, and this is one of the remaining big wins in terms of speed, as well as ticking lots of other boxes.
If it helps I can paste in the standard anonymised addthis code.