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United Kingdom-based Tweetmeme announced a few impressive milestones this week. The company is serving nearly 500 million impressions each day of its light-green retweet button (pictured right), which you can click on to share content through Twitter.

Founder Nick Halstead said that in a matter of weeks, the retweet button will be on more than 200,000 websites.

The only problem? Facebook’s social plug-ins have already reached 200,000 sites and it took them only six weeks following their launch in April. That’s a fraction of the nearly year-and-a-half it has taken for Tweetmeme’s retweet button to reach the same number of sites.

Plus, Facebook chief executive Mark Zuckerberg also said that on the day of launch, the social network would serve 1 billion “like” buttons by the end of the day. That’s twice the number of buttons Tweetmeme is serving now.

Granted, Tweetmeme popularized the idea of using a button to share content socially. They were more of a first-mover and Facebook latched on with its own variation a year later. Tweetmeme is also a much smaller company with just 650,000 pounds in funding and operates independently of Twitter.

With Facebook’s plug-ins and like buttons swiftly spreading across the web, this may be another sign that Twitter has another hole to fill. When Twitter bought Atebits, the maker of iPhone app Tweetie, earlier this year (to the dismay of many mobile Twitter app developers) it argued that new users were confused when they couldn’t find an official Twitter iPhone app in the store. Perhaps the same confusion is hindering Tweetmeme’s growth, and Twitter should consider buying and bringing Halstead’s creation in-house.

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