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For all the press that FriendFeed got last week for allowing people to post replies directly to Twitter, it was still 65th on our list and registered barely a fraction of total tweeting activity. Some analysts think FriendFeed is a threat to Twitter's existence, but remember that 56% of users still interact with Twitter on the main site, and Twitter makes up 44% of activity on FriendFeed. So which service is really more reliant on the other?

There are a ton of Twitter clients out there. We saw 142 different ways to interact with Twitter in just 24 hours of monitoring the site's public feed. That's an amazing amount of activity on their API, and their application ecosystem is growing every day. Clearly, Twitter has struck a nerve with developers and users alike.