Keep your Internet footprint as small as possible.
I don’t twitter or FB, since I don’t have the need to tell everyone I am in the Starbucks restroom doing a #2.
I also have never trusted eBay nor Craigslist.
I do some online purchasing but it is impossible not to. It might be possible to link my purchases to my income level, but they are pretty normal (not that I approve of Big Brother looking over my shoulder).
The Moral: STAY AS ANONYMOUS AS POSSIBLE ON THE INTERWEBZ!
I have been very happy with my purchases from eBay.
This is scary stuff, and I stopped using Facebook for the reasons you refer to. (But I sure do miss seeing those photos of the grandchildren. The kids send some of them to me, but I miss the real time updates about them.)
That's good. Let the pervasive progressives indoctrinate all the 20-something and next generation teen voters who live their lives there.