Leave it to pg to keep a cool head: There are some concerns about a new budding tech bubble as some startups have reached titanic valuations — Twitter, for exa

Leave it to pg to keep a cool head: There are some concerns about a new budding tech bubble as some startups have reached titanic valuations — Twitter, for example, was recently reported to be worth around $10 billion — without having a business model nailed down. But those cases are few and far between, and there are fewer investors in those types of companies than there were in the late 90s, Graham said. The amount of money companies are raising today — relatively speaking and adjusted for inflation, naturally — is less than what companies were raising during the last tech bubble, he said.