Final answer:
The best security practice for using social networking sites is adjusting your privacy settings to limit who can access your information and to be cautious with friend requests.
Step-by-step explanation:
The security best practice when using social networking sites is c) Adjusting your privacy settings to limit access to your information. Social networking platforms offer various privacy controls that enable users to restrict who can view their profiles, posts, and personal information. It is important to be careful when accepting friend requests from people you don't know and pay special attention to your privacy settings to avoid oversharing information with the public or potential scammers. Moreover, engaging in practices like bad-mouthing employers, posting inappropriate pictures, or making discriminatory comments can have severe consequences for one's professional reputation. Alongside adjusting privacy settings, users should be wary of clicking on links and opening attachments from unknown sources, as these could be phishing attempts or contain malware.