Venture Capitalist Fred Wilson bet $10M on a start-up called Twitter. Five years later, Twitter has no profits, but it has brought down governments and a Congressman and is valued at $8B. Fred tells Jim Zirin what accounts for Twitter’s meteoric rise.

Who will Lose the battle in Iran, Khamenei or the Internet? Iran was so terrified of Twitter, it jammed the Net for a day and named Facebook, Twitter and YouTube as co-conspirators in political trials.

Last August, Twitter, the social network site, was the victim of a massive denial of service attack. Who did it? Why has Obama delayed appointing a cyber czar when our critical infrastructure is so vulnerable to cyber attack?