Netscape

The founder of Zynga, the hottest start-up to emerge from Silicon Valley since Twitter, is looking to build an enduring Internet icon to rival the success of Google.

Betaworks has fostered some big hits, like TweetDeck and Bit.ly, but it is trying to grow carefully, with a symbiotic group of companies.

Betaworks has fostered some big hits, like TweetDeck and Bit.ly, but it is trying to grow carefully, with a symbiotic group of companies.

Not long ago, many were leery of using their real names on the Web, let alone sharing personal details about their shopping and habits. But a new wave of start-ups are exploiting a mood of online openness, despite possible dangers.