Betty Lou, I agree that you raise a really good point (and common fear) about social media regarding the perceived lack of control we have over messaging. This is something I hear from people and organizations all of the time. As a communications professional, and unabashed lover of all things social web, I try to encourage people to re-frame this fear as a challenge to do better. By using social media, organizations are opening themselves up to everything from spam to accolades to harsh criticism, and this is a scary prospect! What I try to remember is that social media allows us to be in closer, more immediate (real-time) contact with the population we are trying to serve, and this digitally facilitated intimacy forces us to keep on our toes and truly meet their needs as best we can -- because if we don't, we're going to hear about it, and so will everyone else.
I know this response doesn't speak to your completely legitimate concerns about triggers and cyber bullying and I'm not trying to dismiss or minimize these very important points. Using social media as an individual is very different than using it as an organizational body with a whole host of different challenges and concerns. I just wanted to offer my perspective that I see working in this field, especially using it to try to engage young people like myself (and younger!), is forcing mental health service providers to work smarter and better by challenging us in new ways. 