Social media's uphill advertising climb

news.cnet.com — MOUNTAIN VIEW, Calif.--Reality check: half of the social media start-ups at Tuesday's Under the Radar Conference won't exist next year.That was the dour prediction of an advertising executive after a day of start-up presentations from a tongue-twisting list of tech companies--including Verismo, Mytopia, Loud3R, Jacked, Sometrics Jun 4, 2008 View in Crawl 4