Drones and Google glasses may be a lot of fun for the person controlling them, but for everybody else they are likely to be a nuissance.
They are technologies whose use obviously affects others. Being allowed to use them at a given location is not just a matter of individual freedom, since using them affects the freedom of others not to feel spied on, or not being disturbed by the buzzing overhead.
It will be interesting to see how it plays out. How will we enforce drone or glass – free zones?