-- Viacom warns of slowing ad growth: CEO Philippe Dauman told attendees at the Bernstein Strategic Decisions conference that U.S. ad revenue would be likely to grow between 3-4 percent, essentially flat year-over-year. Earlier this month, Viacom (NYSE: VIA) forecast Q2 ad gains of 7 percent, which would be in line with its Q1 results.

-- Adweek’s ones to watch: Gearing up for New York’s Internet Week, the Nielsen Media mag profiles five notable digital shops: search marketer 360i, Big Spaceship, Deep Focus, EVB and Schematic, acquired by WPP Group last year.

-- Coors toasts social nets: Digital shop AvenueA/Razorfish has answered Coors’s friend request. The beer marketer will bring its Code Blue campaign, which promotes its wider mouth can, with apps on Facebook and MySpace features. The agency is also working on using text messaging in its next TV spots. Tim Sproul, group creative director, perhaps inspired by rising unemployment can see it now: “Imagine being able to ‘Code blue’ someone on your iPhone,” he added, “and say, ‘I just got laid off; you better go buy me a Coors Light at the local bar.’ ”

-- Nielsen takes another mobile measurement step: The Nielsen Company is expanding its 10-year-old online audience profiling system @Plan to mobile, covering demographic data on users of 200 major mobile sites. More details on our sister site, MocoNews.net

Register for our EconAds seminar, June 3rd, at the New World Stages in New York City. Covering the economics of online advertising.