alexander,
I think you have already identified ways to establish the boundaries that you feel comfortable with that are no different than how you would establish boundaries in your interactions through social media. Another way to establish the boundaries that you feel comfortable with (since everyone will be different) is to simply establish expectations by educating your students on the use of social media for career development. If you guide your students and educate them on how to manage their personal online brands, how to present professionally via social media channels, how to appropriately use social media tools, and how to interact online, this not only educates them in valuable skills, but also sets up expectations of your role as a coach/educator even in the social space. If a Career Center has a Facebook fan page, it allows all Advisors to log in under the department account which is a way for you and your department to maintain the type of presence you want on Facebook. The same is true for all social media platforms. I think people are so accustomed to using social media tools for personal reasons that it can be hard to imagine using them for professional goals when in reality, it enhances one's ability to reach their professional goals. It is important to stay current with social media trends to understand the implications for career advising. How have the trends in social media recruiting, professional branding, online reputation management, social media background checks, or even the new ways in which one can research employers via social media impacted the way you adapt as a Career Professional?
Robert Starks Jr.