Tweets are publicly visible by default; however, senders can restrict message delivery to just their followers. Users can tweet via the Twitter website, compatible external applications such as for smartphones, or by Short Message Service (SMS) available in certain countries. While the service is free, accessing it through SMS may incur phone service provider fees. Users may subscribe to other users tweets, this is known as following and subscribers are known as followers or tweeps (Twitter + peeps). The users can also check the people who are un-subscribing them on Twitter better known as unfollowing via various services.
In June 2008, Twitter launched a verification program which allowing celebrities to get their accounts verified. Originally intended to help users verify which celebrity accounts were created by the celebrities themselves and therefore are not fake, they have since been used to verify accounts of businesses and accounts for public figures who may not actually tweet but still wish to maintain control over the account that bears their name - for example, the Dalai Lama. Verified accounts can be identified by a white check in a blue background, known as a verification badge, next to the user's full name, on the profile itself or next to the name in search results.
Messages
Users can group posts together by topic or type by use of hashtags – words or phrases prefixed with a
"#"
sign. Similarly, the "@"
sign followed by a username is used for mentioning or replying to other users. To repost a message from another Twitter user, and share it with one's own followers, the retweet function is symbolized by "RT" in the message. In late 2009, the "Twitter Lists" feature was added, making it possible for users to follow as well as mention and reply to ad-hoc lists of authors instead of individual authors.
The messages were initially set to 140-character limit for compatibility with SMS messaging, introducing the shorthand notation and slang commonly used in SMS messages. The 140-character limit has also increased the usage of URL shortening services such as bit.ly, goo.gl, and tr.im, and content-hosting services, such as Twitpic, memozu.com and NotePub to accommodate multimedia content and text longer than 140 characters. Twitter uses its own t.co domain for automatic shortening of all URLs posted on its website.
Tweet Contents
San Antonio based market-research firm Pear Analytics analyzed 2,000 tweets and separated them into six categories:
Content of Tweets according to Pear Analytics
News - 4%
Spam - 4%
Self-promotion - 6%
Pointless babble - 40%
Conversational - 38%