For those of us who (and I include myself in this) are concerned about security, this article on Survival Blog contains some excellent pointers on what to do (and not do).
http://survivalblog.com/being-anonymous-by-spotlight/If the concept of the "grey man" is not familiar to you, please do a net search on the term (please don't use Google...) and remember that not everything you find on the net is true... If you experience disbelief at that concept, then perhaps it is time to apply some of the items mentioned in the article.
Let me point out that many of us in the group are exercising some or many of the concepts mentioned in the article.