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Twitter is a website, owned and operated by Twitter Inc., which offers a social networking and microblogging service which enables its users to send and read other users' messages called tweets. Tweets are text-based posts of up to 140 characters displayed on the user's profile page. Tweets are publicly visible by default, however senders can restrict message delivery to their friends list.

All users can send and receive tweets via the Twitter website, compatible external applications (such as, for smartphones), or by Short Message Service (SMS) available in certain countries.[9] While the service is free, accessing it through SMS may incur phone service provider fees.

Since its creation in 2006 by Jack Dorsey, Twitter has gained notability and popularity worldwide and currently has more than 100 million users worldwide.[10] It is sometimes described as the "SMS of the Internet."[11]

Google Buzz is a social networking and messaging tool from Google that is integrated into the company's web-based email program, Gmail.[1][2] Users can share links, photos, videos, status messages and comments organized in "conversations" and visible in the user's inbox.[3]

Buzz enables users to choose to share publicly with the world or privately to a group of friends each time they post.[4] Picasa, Flickr, Google Reader, YouTube, Blogger, FriendFeed, identi.ca and Twitter are currently integrated. The creation of Buzz was seen by industry analysts as an attempt by Google to compete with social networking websites like Facebook and microblogging services like Twitter.