Twitter changed the rules (terms of service) last week. Their official blog stated "The revisions more appropriately reflect the nature of Twitter and convey key issues such as ownership. For example, your tweets belong to you, not to Twitter." Twitter feels that with the data they have collected during Twitter's brief existence, the popular micro messaging site is now better prepared to shape their terms of service to match their constantly changing environment.

Here are the four most important areas covered in the terms of service revisions:

Advertising- Twitter has left the door wide open to advertising on the site. With the success of Facebook and their advertising solution, I think it will be a very short time before Twitter is selling advertising on the site. With 45 million users who can blame them, It's the natural evolution of business.

Ownership- Twitter's position on the ownership of your Tweets is this, while they are able to "use, copy, reproduce, process, adapt, modify, publish, transmit, display and distribute" your Tweets, the Tweets still belong to you.

APIs- You've seen those applications that list your Tweets and allow you to collect followers. Twitter has a draft that directs application developers in requirements associated with their interaction with Twitter users. The guidelines are strict and they are designed to protect Twitter users and their privacy.

SPAM- No one likes spam, Twitter has been operating under a strict set of terms covering and restricting spam for some time now. These terms are in place to protect Twitter's users.

You should be receiving an email soon from Twitter, about the recent changes. What do you think about it, leave a comment, we want to hear from you.