ADWEEK — A new six-country survey from DDB reveals that Facebook users who like a brand's page on the social networking site use its products regularly or occasionally and, after following the brand on Facebook, more than a third of the respondents "want to buy this brand's product more." Brand page fans on Facebook also feel comfortable recommending the brand to friends, with 49 percent of the respondents saying they would "certainly" do so and 43 percent saying they "probably" would. Collectively, that's a whopping 92 percent who qualify as brand advocates -- a figure that staggered survey leader Catherine Lautier...