Mobile ad spending on Facebook passed desktop in Q1 2014 to account for the lion’s share of ads on the social network — and growth doesn’t appear to be stopping any time soon. According to data from Nanigans, advertisers continued to shift their dollars from PCs to mobile devices last quarter. In Q3 2014, mobile accounted for 62.0% of Facebook ads served on the source’s platform worldwide, compared with 38.0% for desktop.