Honestly, I am probably pretty late to this party. I am not, on the whole, very tech savvy and have probably managed to litter the landscape over the years with bits and pieces of me. I have been slowly trying to undo the damage in the last year or so, but the recent social climate is such that it is too much of a chance to take anymore.
The thing that managed to put me close to the edge was Amazon and their ads. All of a sudden before I knew it, things I have had to research at work starting showing up on my personal accounts as suggestions for me to be. I did not cross the streams between work and home - how did this happen? Someone was obviously working overtime to gather data on me and what I was up to.
But the thing that has put me over the edge was reading a report that FaceBook had tested an function whereby others can vote on whether or not your posting is "appropriate". Suddenly, the mob now determines what is acceptable. And if they see you there, they will start to run you down everywhere else you are on the InterWeb.
Not that they seem to make it easy, it seems. Trying using a non-common web browser and all you get is "We do not recognize this log on". Every time. The Very Large Internet Companies very much prefer you use their tools, not others.
I am sure on the whole this will not make a great deal of difference in the long run - but at least, in my own mind, I am doing what I can to prevent the commercialization and probable eventual demonization of....me.