Are we Contributing too much Online?

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I see that alot of people here are members of money-making websites that track your searches or give you a special toolbar to use to keep data and I wondered if any of you had your concerns about these methods?I mean its not uncommon for businesses to follow these practices besides credit card companies, bill collectors, probably even grocery stores sell your information all the time but yet people are now willingly contributing that information when theirs so many loopholes in security online. I even think about this website sometime, information is the new gold (Read "The Fifth Generation" by Feigenbaum) and then sci fi thrillers where tapping into human thought is the big experiment. What about when government tried to confiscate all the purchase data of book store customers and yet we have Shelfari.com where we willingly give it out--Im not trying to sound ludicrous because I love mylot and definately Shelfari but isn't the security concern always loooming in the back of your head--every year new security measures have to be built because the pace of information exchange is surpassing us and only growing. The satisfaction is immediate but at what cost to us?