PC World — Twitter's new retweet function is slowly rolling out across its network. If you don't see the new feature yet, you will soon, Twitter co-founder Evan Williams said in a recent blog post.

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Retweeting goes to the heart of what Twitter is all about, because it exposes users to interesting topics, blog posts, or news items they may not have otherwise seen.

For the uninitiated, a retweet is a way to rebroadcast another twitter user's message. Originally, you had to copy the username and message into Twitter's text entry box and type the letters RT in front of the message. If the retweet took up less than Twitter's 140-character limit, you could also add your own comments. Now, with the new retweet feature, you can rebroadcast messages in just two clicks.

Retweeting is currently available only on Twitter.com, but third-party developers do have access to the new feature so it should be coming to your favorite Twitter client in the near future.

Like many other features on Twitter, the custom of retweeting started with Twitter's community of users before the company formally adopted the practice.

But unlike other grassroots Twitter features such as hashtags and @replies, there are things to love about Twitter's official retweeting function, and things to complain about.

The Good

Less Noise: Sometimes a popular link or comment can be reposted by any number of Twitter users you follow. If you've already seen the link, retweets like this can plug up your Twitter stream with a lot of noise and no added value. Now, the same retweet sent by multiple people you follow will only appear once in your Twitter stream. (Click for a closeup of the illustration.)

Granular Controls: You may love to see tweets from your sister, but what if she sends out way too many retweets? Twitter has got you covered by allowing you to turn off all retweets from your sister. You'll still receive her original posts, but all those annoying RTs will be gone forever (unless she uses the old school RT method, that is).

Context and Discovery: Whenever you see a retweet, Twitter will present you with the original, unedited tweet next to the name and photograph of its author. This means you may see a lot of unfamiliar faces popping up in your Twitter stream from now on.   The advantage of seeing all those new users is that you're immediately exposed to new users, and you may even choose to start following some of them.

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