SAN FRANCISCO: Lynn Fox, former director of communications at Twitter, has joined Klout as acting head of communications.

Working from the company's office in San Francisco, Fox reports directly to CEO and founder Joe Fernandez. Fox is working for Klout on a contract basis, but the relationship could be extended long term, she said.

Klout, a social media influence-measurement tool that launched in 2008, uses analytics to determine the score of consumers and communicators.

Fox is responsible for developing consistent ...