I love Ghostery. It tracks the trackers and gives you a roll-call of the ad networks, behavioral data providers, web publishers, and other parties interested in your activity. It gives you more control over who you allow to track you.
If you find it interfering with website features such as Disqus, you don't need to uninstall it ... you can always temporarily disable it to pause blocking.
Click the Ghostery icon in Safari's toolbar; then click the "pause" button in the resulting window and reload the page you're viewing. This works for all Disqus-powered comments pages I've visited. When finished, click the "play" button to resume blocking. Hope this is helpful!