With the recent news of Facebook leaking personal data to Cambridge Analytics, people should become more aware of what they could unintentionally share to the world (at a nice profit to many), and take steps to protect it.
There are tons of software that can do the job of hiding, and/or wiping your data from your PC, tablet or phone, perhaps making it safe. There is free software available, such as Avast! or Clean Master, but has limited options, compared to purchased or subscribed versions. In addition to having this software, the best practice is to learn to wipe your personal data from your machine yourself as frequently as possible.