Ulterior Motives

I do believe my computer has an ulterior motive. I'm not usually one that looks for motives or suspects someone is out to get me, but in this case, I'm not so sure. I "browse" a lot (well, not a lot) on Overstock, Amazon, Ebay - you get the picture. Whenever I sign into my email account anymore I've noticed similar items that I have looked at appearing on my sidebar ? ? ? I thought it was just coincidence. I'm thinking: "Hey look, they advertise things I'm interested in! How cool is that?"
But, I just logged off Facebook and as I was doing so I again noticed similar items on the sidebar there that I have perused in the past. Hmmm. . . . .
Then it dawns on me that these sights are "stalking" me! ! ! The nerve, the audacity, the invasion of privacy, the scary thought, the "how do they do that?" of it all! ! !
Isn't anything "sacred" anymore? Can't one just chat with friends without being subjected to big business "creeping"?
I feel - so - vulnerable - and - stupid
I guess you can't stop modern technology ~ ~