A few commenters have suggested that they have nothing to worry about because they let no "sensitive" information out onto the web.
Sorry to break it to you, but the world is not fair. People are sometimes framed or kangaroo-ed into apearing guilty of something when they are clearly not (I have had it happen). Sometimes, various authorities need to catch someone to hang blame upon for some crime. I've even heard cops tell a public defender, "We know he didn't do it, but we know he's a bad kid, so we got him."
Also, numerous (unregulated) consumer-monitoring agencies scrape up everything from public databases, buy lists from shops, service providers, your bank, your phone company, your credit card company, and your grocery "club card," sold subscriber lists, and so on. All of this data is correlated based on a few unique or semi-unique identifiers such as full name, SSN, phone number, credit card transaction number (it's illegal to track by CC #, but they get around this.), bank and account's last-four digits, addresses, and so on. This approach does produce some viable correlations, but typically yields "profiles" that are rife with errors.
HR departments use reports from these aggregators as if they were 100% accurate. There is no law in place that will allow you to opt out, to see their entire file on you, or to correct errors. There are anecdotes of people searching months for a job, only to find out at some point from an interviewer that, "you have XXXXX crime in your profile," even if you don't have a record. I once had collection agencies coming after me from Time-Warner Cable for bills on a Texas account — I have never lived in Texas, but the burden of proof was on me.
Despite what the aggregators would have everyone think, names are not unique. Phone numbers are not unique, as they are recycled. Email addresses are often not unique, as they are recycled.
Like it or not, there are many profiles on you that are beyond your access, and the law has not yet caught up with these practices.