I'm with you and the previous commenter. People who feel "tricked" we're only fooled by their own blindness. Sorry, but then trying to garner sympathy for that is like being asked to feel bad for the stripper that takes her clothes off for money; they both 100% knew what they were getting into and no other reasonable expectations can be had from engaging in that situation.

Facebook has been around something like a decade, now? I forget the exact number, but it's been long enough that everyone should have learned their lesson at this point; if you are creating data, be it personal, geospatial or otherwise, by using a product expect that data to be used as a commodity by the makes of said product.