said by StuartMW:said by La Luna:...unless they're interested in things like my dog eating a package of Peeps...
Well if a law is ever passed making feeding dogs Peeps illegal they'll know where to find you.
And that's the point. One can never know how all this information will be used against you sometime in the future.
Here's a specific example for you. Suppose you apply for some job but the employer hates dogs. In this day and age they'll find your FB page. You'll never know, if you don't get the job, whether that was a factor or not.
I know that's a hypothetical situation, but frankly, if that's the way they felt about dogs (for example), I wouldn't want to work there anyway! So maybe it works in FAVOR some of the time.