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For the numberfags, mobile footers are definitely your better bet overall if you have to choose, 16 cents/1000 impressions as opposed to over 50 cents per on desktop. Good experiment overall, unfortunately cancelling them voids the record of money spent out of the total budget, but I put $25 into both and neither ran out after over 2 days. If you're a 2/low 3 view and have a big event coming up it's worth the money