Enter the MyTracks Social Plugin! It automatically launches in the background after you save a new track in MyTracks. Once it's set up, you won't see anything except a simple notification when the track is posted. Simple, easy, and completely transparent!
Currently the app only posts your stats (distance and time) but I might also add the ability to automatically post to Google Maps and customize the posted message in future updates if the app is reasonably popular.
The MyTracks Social Plugin is available for $.99 in the Android Market. Please leave a comment if you have questions or suggestions.