Retweet.com has been sold on Flippa for $250,000.  Retweet.com received about 45 bids total before someone clicked “buy it now.”  Retweet.com aggregates popular links on Twitter.  The service is very similar to Tweetmeme.  Currently Retweet.com does not have any revenue sources. [Mashable]

Today Seesmic Web has improved their web-based Twitter client. Seesmic Web has added a contact manager, threads Twitter conversations, and allows you to drag and drop followers into lists. There is also Tweetmeme stats built into Seesmic’s updated web-based client. Unlike Twitter.com itself, Seesmic Web also lets you upload photos to a host or take a picture from your webcam to share on Twitter. [CNET]

ReTweet.com is a service based on retweets, the repeating of status messages on Twitter of people that you follow.  ReTweet has about $1.4 million in funding no funding (e-mail from ReTweet) and their biggest competitor Tweetmeme has about €650,000 ($926,000) in funding.

Both companies are really picking up steam in the ReTweeting business and TweetMeme does not like it.  TweetMeme has threatened Mesiab Labs, the company behind ReTweet.com for copying their website design and copying their retweet button code.

The only problem with these two companies is that Twitter themselves are interested in getting into retweets too.  If Twitter starts counting how many times status updates have been repeated and even creates a widget that showcases the count, these two companies will be out of luck.

Update: ReTweet is valuated at about $4 million by Leapfish.

Tweetmeme is becoming a useful way to share content on the web.  Tweetmeme is closing down their original news filtering service in order to focus mroe on ranking stories by retweets.  The Tweetmeme homepage displays stories based on the most recent, top in 24 hours, and top in the last 7 days.

As part of the shut-down of the news filtering service on Tweetmeme, Fav.or.it will also be shutting down.  Fav.or.it is by the same developers as Tweetmeme.  “TweetMeme became our focus for several reasons, firstly the trend towards status messages (micro-blogging) meant that access to real-time news was becoming a reality and that our aggregation + filtering technologies could be very quickly leveraged to take advantage of it,” stated Fav.or.it CEO Nick Halstead.

The Fav.or.it website will become the company website.   Fav.or.it also runs a service called TweetTabs.  TweetTabs is a website that opens up multiple tabs when searching.

[via Mashable]