While “Addthis” is supposed to be an helper, it is an annoyance for me because when you hover the mouse over it, a window popups and stays there until you manually close it.
An easy way to block it if you use Adblock plus, is to add the following filter (Tools – Adblock Plus Preferences – Filters – Add Filter..):
.addthis.com/*
<img src="/notes/wp-content/uploads/2010/07/Screenshot.png" alt=" title=“Addthis Popup” width=“200” height=“160” class=“alignnone size-full wp-image-769” />