Corporate surveillance is, in my life, a bigger deal than government surveillance.
I think Zeynep Tufekci described the situation really well with the title of her recent Ted Talk: "We're building a dystopia just to make people click on ads".
I don't think it makes sense to separate those two... if that data is collected by a third party and made available for sale, the government can buy it too.
Most people, myself included, wouldn't survive if directly targeted by the government - so I exclude them from my threat model. But I do hope that being wary of commercial surveillance will at least reduce the footprint I leave behind.
I think Zeynep Tufekci described the situation really well with the title of her recent Ted Talk: "We're building a dystopia just to make people click on ads".