13 of 13
BACK NEXT
Twitter
Twitter
2006
Part of a trend called micro-blogging, Twitter lets people broadcast what they're doing and thinking in 140 characters or less to their friends on the Twitter site. Twitterers can also use IM or e-mail to read and post updates, which only encourages the messages to keep coming 24/7.

More galleries
Last updated March 26 2008: 10:19 AM ET
* : Time reflects local markets trading time.† - Intraday data delayed 15 minutes for Nasdaq, and 20 minutes for other exchanges.• Disclaimer