In addition, Factiva scans Twitter.com feeds to score individuals based on the number of times they tweet, as well as the number of times they're mentioned in tweets.

WSJ: Methodology for NYIndex

We also looked closely at prices, totaled up mentions in the print media over the past year as tracked by Factiva and took into account recent gallery exhibitions, museum shows and awards.

FORBES: Magazine Article

An algorithm then generates a Factiva influence score.

WSJ: Methodology for NYIndex

The media metric is comprised of news hits (Factiva) and TV and radio appearances (LexisNexis) from the past 12 months, plus social media presence: Facebook fans, Twitter followers and YouTube channel subscribers, all as of July 2012.

FORBES: Ranking The World's 100 Most Powerful Women 2012

Using Factiva, a Dow Jones-owned media-archive service, about 25 New York-centric newspapers, magazines, websites and blogs are scanned daily and scored based on what names are mentioned, the number of times the name occurs and the placement of the mention in the article, such as in the first paragraph, in a headline or caption.

WSJ: Methodology for NYIndex