Reputable sites such as Amazon, Facebook and Google often provide a way you can opt out of interest-based ads.
For Amazon, see [ame]http://www.amazon.com/gp/dra/info[/ame]
For Facebook, see
https://www.facebook.com/help/247395082112892
For Google, see
https://www.google.com/settings/u/0/...nticated?hl=en
I don't recommend ad blocker extensions for your browser. They can cause too many problems. Plus they deprive websites that are provided to you free revenue they need to continue providing the service at no cost.
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bc