A brief Signal today till I can write later in the day, running to an early meeting:

20 Metrics To Effectively Track Social Media Campaigns (SEL)

Supreme Court's Devastating Decision | Ronald Dworkin | NYRB | 26 January 2010 (Off topic, but I found this take interesting)

Social Is the Top Priority for Marketers in 2010 [STATS] (Mashable)

Yahoo CEO Eyes TV Ads, Acquisitions (GigaOm, Yahoo earnings spin: We compete with TV, not search!)

AT&T Planning To Launch Yelp-Like Site Buzz.com (SEL, Good luck with that!)

Microsoft, Hearst Join Media Consortium (Worldscreen via IWM, this is about measurement)

Oh, and Apple has an announcement, I hear. (Links)