Don't treat Facebook like a dating website. Instead of accepting every friend requests that comes across your newsfeed, check out and look into who you are actually "befriending." Check the lists to see who your mutual friends are, where you would know this person from and/or where they are located.
Use privacy settings on Facebook so people, who are not your friends, don't have access to your social networking page. Being secure will prevent others from taking pictures and information from your site. Keep in mind there are other social networks that you may use such as Twitter, Instagram, LinkedIn, Pintrest, MySpace and the Google+. Use privacy settings and precautions when utilizing these networks.