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(Updated: Added comments from Glu Mobile, Gameview Studios, W3i and more data about apps that have seen ranking shifts. We’ve also added stories here about Facebook’s strange rise to #1 yesterday and how Apple has started rejecting apps that use offer walls. As of Tuesday, April 19, we’ve also added another story showing that new titles are beginning to bubble back up again on the top free charts.)
It looks like Apple made a number of changes to the app store’s ranking system last week, adding in new weights on top of download numbers to determine top apps, according to conversations we’ve had with a few pay-per-install and mobile advertising networks.