This week, Twitter CEO Dick Costolo told the New York Times how he plans to continue to monetize his service:

Twitter’s core business of selling ads that are inserted into the flow of tweets that every user sees has plenty of room to grow, he said. The social network’s ideal model is for ads to make up about one in 20 tweets that the average user sees - the same level that Facebook strives for. "We're well below that now," he said.

The web, which has long been in competition with Facebook and Twitter, is racing to catch up. Analysts haven't been kind; last month, an editorial in Forbes sniped that "the web doesn't seem to be trying to raise its market cap at all". This has led Carl Icahn and others to question whether a new board is in order. In response, Tim Berners-Lee, CEO of the web, told reporters this week:

Starting this quarter, we're monetizing the web. Around 5% of the written sentences that users, or "surfers", see will be tasteful contextual advertising, which will add value and increase engagement. We've always been about linked data, and now we're linking it to a number of easy, convenient ways to pay to reach your audience.

The web will also introduce a new Pro version, launching this September, which will include several new tags, unlimited access to HTTP, and a "professionals mode".