Audiences are voicing snap judgments on movies faster and to more people than ever before on Twitter, and their ability to create a box office hit or a flop is forcing major studios to revamp marketing campaigns. The stakes are especially high this summer season when big budget movies like “Harry Potter and the Half-Blood Prince,” which opened on Wednesday, play to a core audience of young,... 

Micro-blogging site Twitter plans to introduce tools and services by year-end to help businesses serve their customers, and may charge fees for such services, co-founder Biz Stone said on Monday. “We’re looking at who’s using Twitter and for what,” Stone told the Reuters Global Technology Summit in New York via videolink from San Francisco. “Are there any commercial usages... 

The popular online hangout Facebook is revamping its home page and plans other changes so its millions of users can more easily choose the types of information they see. Perhaps taking a cue from Twitter, the rising service for letting people express themselves in 140 characters or less and keep up with what celebrities have to say, Facebook said it will let users follow public figures like President...