1. Social networking takes time away from other activities and can take over from real time interaction.
2. Social networking formats set up expectations of importance for certain types of communication at the expense of other types. Pictures and phrases on a wall can take the place of phone calls and face to face time with family and friends.
3. Social networking magnifies the gap between people who have access to computer technology and those that don't, exacerbating other social inequities.
4. Social networking can compromise privacy in a big way.
5. Social networking can force changes in public policy which can either be a good thing or a bad thing depending on whose ox is gored. Employers can now make access to private social networking history a condition of hiring. Lawmakers may want to change that to prevent discrimination.
6. Social networking can be used to destabilize governments and to advance terrorism.
7. Social networking can be used to promote organized crime.
8. Social networking can become a venue for bullying.
9. Social networking can be a vector for simplifying language, thereby limiting concept development and expression.
10. Social networking can leave an indelible personal history that keeps a person who has grown past a bad time from moving on freely.