Location-based services don't have to mean "I am revealing my exact location to anyone and give them permission to annoy me."

The basic "use the GPS and give me directions from here to somewhere else" fall into this category.

So do "where's the nearest [whatever]?" queries or "show me the locations of all the people I have permission to see."

Because of the kickback, I don't expect we're going to see proximity-based ads except on an opt-in basis. And I will opt in if the basis is "you pay me a dollar and you can send me an ad when I walk by your store."

Roger