You can find the new TweetMeme search engine here: http://search.tweetmeme.com/
Searching TweetMeme for Popular Facebook Tweets
Updating the Same Search for "Best Match"
The search engine indexes new stories as they are found in Twitter, and offers a great deal of filtering and customization. You can sort results by "Best Match", "Age" and "Retweet Count", showing the most popular forwarded tweets. Meanwhile, the results display categories for each update, and you can even filter by the media type, including news, images or videos.
You Can Filter Results In a Number of Ways on TweetMeme
Like any good search engine for monitoring the new world of real-time updates, TweetMeme even lets you sign up to get search results by RSS.
Searching TweetMeme for louisgray.com Shows Most Popular Posts on Twitter
For site owners, like me, the ability to search TweetMeme for your own name or domain name, and sort results by category or popularity in retweets is a great improvement, letting you determine what stories were deemed most popular on Twitter, and you can dive down to see who is getting to the data first and has the most influence, or ability to get their updates redistributed through their network.
TweetMeme is a product built by the team behind fav.or.it, headed by Nick Halstead. You can, of course, also follow TweetMeme on Twitter.