You will find here a few tips to keep you safe, that I try to stick to when using social networking tools and technologies.
1: Allow only the people you know
2: Allow only the people whose details etc can be checked (google them or send them a message asking for further details)
3: Make publicly only those images that show you in a positive light (family, sport, etc).
4: Only allow your friends to see all of your images
5: Be careful of the language you use - no employer would like an employee to cuss all the time
6: Be careful of what you say
7: Block anyone who acts in such a manner that it could have a negative impact on your profile
8: Block instantly anyone who acts in a destructive possibly fraudlent stalkers
9: Never divulge your physical address details
10: Keep your profile clean and simple
11: Report anyone harassing you or acting inappropriately
12: Add widgets and gadgets that are appropriate
13: All personal messages should be sent via email, not on the home page of your site
14: Employ the core of the stranger danger strategy - it must be employed and offline:)
That is 14 with more to come. If anyone has and would like to share more then please add in the comments box