Courts reaffirm that emails can be used in court.

Absolutely! With the rise of "sexting" I alway emphasis that you can't put the genie back in the bottle and you can't control what the person does with them after you send them. "Revenge" sites, "make them famous", 4chan, tumblr, are just some of the places things can end up. Just think about the recent "the fappening" leak.

Well, even posting things that are socially acceptable in some situations but not in others can be hazardous.

For example:

- Using legal substances to excess
- Owning firearms
- Having religious and political viewpoints
- Having a social viewpoint that is unpopular and can affect your interactions in the workplace

Like the Marine that got hot water over some Anti Obama posts on social media.

Well, let's say I'm a High School science teacher. Let's say I post on social media frequently about Creation Science and my religious viewpoints.

Can I be asked not to post such opinions? Can I face disciplinary action for said posts? Can I be fired for said posts? Might the administration start looking at me under a microscope anyway?

Lots of possibilities out there when you're posting to social media.