A new nonprofit launched Wednesday by a tech advocacy group and a cofounder of Twitter will focus on using technology to drive improvements in the U.S. education system and other social changes.

Twitter Inc. co-founder Biz Stone said that the denial-of-service attack that knocked the microblogging site offline last week convinced him that the company has to quickly muscle up to deal with its phenomenal popularity and the problems it brings.

Security experts are making progress in their efforts to identify the hackers responsible for the distributed denial-of-service (DDoS) attacks that that crippled Twitter for several hours Thursday.

With Twitter Inc. co-founder Biz Stone ruling out advertising on the social network, the question for the online business world is: What will Twitter do to ensure it can survive the long-term?

Twitter Inc. co-founder Biz Stone said Wednesday the company is not for sale despite reports that Apple Inc. is in late-stage negotiations to buy the microblogging site.

With Ashton Kutcher racing CNN to be the first to have 1 million Twitter followers, and Twitter's CEO Evan Williams sitting down with the ladies on Oprah Friday, what is becoming of the Web site that's garnered such techie love?