Internet marketing firm Lotame found that 300 x 250 “medium rectangle” online ads averaged 13 seconds of “viewing” exposure per user served vs. only 5.4 seconds for leaderboards and 1.9 seconds for skyscrapers. This result is liable to shake up advertising rates since leaderboards and skyscrapers command premium prices over rectangle ads. The study, however, did not look at clickthroughs and conversions which are the most important metrics.
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