Frankly we're surprised "social networking" ranks fourth, since the first order of business for us (after logging into WiFi), is to brag on Facebook & Twitter about how we're on in-flight WiFi, usually followed by an Instagram of the Earth below.
Even more shocking is #9, shopping, considering that's the prime focus for in-flight internet portals. Even before you login to Gogo, there's a variety of options for free web browsing, including access to shopping sites like Gilt and eBay.
Now, note that a #10 is missing. For this spot we'd nominate "planning and purchasing future travel," since airline websites are free to browse over WiFi and what gets you more in the mood to travel than actually traveling and having some peaceful time to ponder?
View the full infographic (and Apple's obvious dominance) below: