As people submit their tracks, data privacy will be a huge issue.
Some people don't care if everybody on the planet knows where they go and when, this would be you Bugbyte :) and some people like to keep their whereabouts private, for example super secret international spies who would like to contribute to the project.
All jokes aside, if we don't address privacy issues many people will not be comfortable contributing.
I'm not sure how to approach this. On one hand it is just a collection of tracks on a server that have no identifiable information about anybody (beyond lat/long location).
Most of us wouldn't go through the effort to analyze data to use it for anything other than map generation. But then again I'd rather not be responsible for people's safety if somebody does find a way to figure out/track a specific contributor.
So the question is, once the data is uploaded, how do we make it public and usable to anybody in the world without compromising the identity of the contributors?
The only solution so far that comes to mind is stripping the beginning and trailing waypoints of each track. For example, if I have a track from my house to my friend's house and that track consists of 100 waypoints, I would strip the first and last 10 waypoints so anybody else would see that the track starts in the middle of a public street and ends in a public street.
Let me know what you think.