While Facebook offers a wonderful way to keep in touch with friends and family, as with any social network, there is potential for people you'd rather not be in touch with to contact you.
If this happens to you on Facebook, you can easily "block" someone. We've taken a look at this process, how to do it and what it actually means once you've done it.
Take a look through our gallery for a step-by-step guide to what happens when you block someone on the social network. Let us know in the comments below any other privacy queries you have about Facebook -- we could cover them in future articles.