MSNBC has an interesting article out this past week called "Where ‘omg, u look gr8’ can land you in court" in which they look at the evolution of sexual harassment in the modern workplace.
Welcome to the new sexual harassment. It's (usually) not about the stuff you see on Mad Men, and it's not chasing the secretary around the desk. . . . [It is more subtle now.] Those subtle areas can include everything from flirtation at a company party to a complimentary text message or an unwelcome invitation to discuss the latest project over dinner or drinks.
The article also has some discussion about the implications of the use of social media (Twitter, Facebook, etc) and the fact that it is somewhat easier to misconstrue an instant message or cell phone text message than it is a verbal statement.