facebook twitter or any social sites?

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Twitter is a free social networking and microblogging service that enables its users to send and read messages known as tweets. Tweets are text-based posts of up to 140 characters displayed on the author's profile page and delivered to the author's subscribers who are known as followers. Senders can restrict delivery to those in their circle of friends or, by default, allow open access. Since late 2009, users can follow lists of authors instead of following individual authors.All users can send and receive tweets via the Twitter website, Short Message Service (SMS) or external applications. While the service itself costs nothing to use, accessing it through SMS may incur phone service provider fees.

http://en.wikipedia.org/wiki/Twitter

Facebook is also a social networking website, but looks different from twitter. Its features are also different. You can read more about facebook on
http://en.wikipedia.org/wiki/Facebook

There are many other social networking sites too like Myspace,stumbleupon,technorati etc.

List of social networking sites
http://en.wikipedia.org/wiki/List_of_soc...g_websites