Fiksu: Holidays still impacting mobile advertising, iOS downloads increased by 13% in January

User acquisition and marketing company Fisku today reported a cost per loyal user decrease of 7 percent from $1.67 in its December 2012 Index to $1.56 in its January 2013 Index. The Boston-based company defines a loyal user as a person who will open an app at least three times. Compared to January 2012’s average cost of $1.14 per user, January 2013’s user acquisition cost is up 37 percent year-over-year, but the drop from December 2012 to January 2013 by 7 percent was not as dramatic as the drop from December 2011 to January 2012 by 59 percent, which fell from $1.81