Digital ads will become more creative in 2012 to motivate a generation often characterized as "stimulation junkies," as marketers focus on capturing 79 million U.S. consumers born between 1981 and 2000. It turns out that 93% of those ages 18 to 34 -- the Millennial generation -- are Internet users, compared with 88% of adults ages 35 to 54, and 42% of adults age 55 and older, according to a new report.