There are several web applications which can be used with Copter/Plane/Rover to allowing sharing flight data, videos or even allowing web based control. Below is the list of known applications (in alphabetical order).
DroneDeploy.com - Simple workflows to get stuff done with drones. Create high-precision surveys, agricultural maps, and point clouds with just a few clicks. Long distance missions without the equipment. Fast connections to your drone with LTE for untethered control over 80% of the US.
dronetrack.org - Real-Time tracking and sharing of flight paths
EXmaps.com - online flight logbook made for the ArduPilot system. Just drag and drop log files for post flight analysis and cumulative flight time
UAViators.org - video sharing site to aid humanitarian organizations and disaster affected communities with greater situation awareness.
If you know of more, or are the owner of one of the above and would like to correct the description please email email@example.com.