Unwise to use code from server you do not know!

See: http://app.webinspector.com/public/reports/25543719
Object: htxp://w.sharethis.com/button/buttons.js
SHA1: eeeefb5bdf15480d271dde0524d9cbcbd843b77a
Name: Suspicious-WI.
Detected:
https://www.virustotal.com/nl/url/c9f291e21220915935bb55dea76b087c8367b2a26f1c4f4e4917277860c0daf8/analysis/
and see: http://jsunpack.jeek.org/?report=168a0d64919295637a5b335d27b1532a40d19216
(Only for security researchers, have NoScript enabled and run inside a VM).
Code from platform.foursquare.com/js/lib/easyXDM/json2.js ( script uses System.Object
on System.Web.Script.Serialization.JavaScriptSerializer)

Furthermore avast! Webshield detects JS:Clickjack-A[Trj] on: http://amouda.org/index.php?catid=3:2012-07-23-12-45-14&id=35:2012-07-28-12-31-50&Itemid=5&option=com_content&view=article

polonus