My Last version of Ghostery was VERY effective and allowed me to block ALL trackers on each site. The newest version PRETENDS to allow me to block trackers but has a select group of trackers, "Twitter Button" on this site for instance. That are UNBLOCKED and won't be blocked no matter how many times I engage the blocking feature. I assume some of these sites MUST be paying ghostery a fee to prevent them being blocked. I'm MUCH less satisfied with the newest version of the program than previous versions.