There is a lot of chatter about TweetMeme’s rather robust growth to over 18 million unique monthly visitors on Compete.com. That puts them ahead of well known sites like LinkedIn and gmail.com with 15 million and 9 million visitors, respectively, on the service). In fact, Tweetmeme currently sits as the 68th largest site on the Internet, according to Compete.
What does TweetMeme do? They offer other sites a “retweet” button that makes it easy for readers to send story links to Twitter. We use it on all our sites, you can see it on the top right of this post. They also have analytics around tweets sent via the service, and a home page that shows the most retweeted Tweets at any given time. It competes with Digg, TechMeme, Google News and other news aggregators to show breaking news.
But is TweetMeme really so big? The short answer is no.
Comscore tracks 721,000 worldwide monthly unique visitors to TweetMeme. Quantcast says the number is more like 2.4 million. Google Trends barely registers TweetMeme against URL shortener service Bit.ly, which is similar to TweetM
I personally see Tweetmeme in use quite a lot, and it has not been around (as far as I know) for NEARLY as long as Digg or Twitter,so I wouldn't personally compare them yet. Furthermore, it might be a bit of a "blogger's niche" where social networking is concerned.