We've done some testing at Sports Geek HQ (hat tip to @Dion_Anthony) to find out what is the best photo size for Facebook Wall posts.

If you look at your Facebook stream on your mobile (go on look right now, we'll still be here), many of the wall posts are quite small but occasionally you see one that is huge by comparison.

Watch the latest episode from the #YouTube140 project to find out how.

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