General Facebook Calendar Data Usage

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http://androidforums.com – Hi, I have a Sony Tipo and one of the great features is a data usage section that tells you how much each app has used within the current billing cycle. Only way I stand a chance of sticking to my 500 MB limit! I've noticed that every month about 100 MB goes on "Facebook Calendar". Why is this? I don't even think I use a calendar on Facebook?!!! Does anyone know how I can switch this off? There's nothing obvious in the Facebook app itself. Thanks! (General)