by Diane Mermigas on Jan 15, 11:59 AM
Time for a reality check on the flashy Consumer Electronics Show and the robust mobile revenue forecasts that have kicked-off 2013. Calmer heads prevailing on Wall Street are warning significant costs will moderate growth rates and value creation, likely wreaking havoc with the rosiest outlooks. Brian Wieser, senior analyst for Pivotal Research Group, estimates Facebook in 2013 will spend $2 billion to generate growth in mobile advertising, which will drive a 43% rise in revenue, much of it front-loaded this year. That does not include the cost of major acquisitions such as Faceboook's $1 billion purchase of Instagram. "Whatever …