I tried it twice already, and deactivated it twice again.
This post on mashable lured me into activating the plugin again:
“Weâ€™re living in tricky commenting times, where your blog content can (and will) receive comments across multiple sites and platforms. It gets to be rather messy, especially if youâ€™re an active FriendFeed user. Now, in an effort to straighten up the comment mess, FriendFeeders who use Disqus for comment management can check a few boxes to pull and post FriendFeed comments related to blog enteries.”
While I was at it, I added all my other services to Disqus. I have no idea what they actually do with it, but then I did that with all the other services, too ;)
Ok, let’s see where this goes – maybe Disqus is better at dealing with my russian comment spammer friends than whatever I have in place locally ;)