Keith's note: Have a look at the Twitter account @ExperienceNASA. It describes itself as "Welcome to your one-stop shop for opportunities to participate in/contribute to NASA goals/missions! Need help? Ask me! Washington, DC nasa.gov". This site is openly operated by NASA civil servant Erika Vick from her desk during the work day as part of her job as executive secretary of the NASA Advisory Council Education and Public Outreach Subcommittee. NASA has confirmed this to me more than once.
Yet when you ask Erika whether this site expresses her opinions or official NASA opinions, she tweeted "@ExperienceNASA isn't official" and also tweeted "@ExperienceNASA points to http://nasa.gov ...any account can do that...had hopes it would be but alas". Yet Erika's personnal Twitter account says "@ExperienceNASA by day". Erika can't have it both ways. If she is going to sit at her desk and use a Twitter account to overtly do her day job and configure the Twitter page so as to give a clear impression that NASA is behind it then she needs to operate it in a fashion commensurate with official NASA social media accounts. Otherwise she needs to make sure it is clear that this is a personal effort she does during coffee breaks. She can't have it both ways.
Is it good to try and enhance NASA EPO? Yes. Is it bad to mislead people in so doing? Yes. Once again it is clear that NASA has no standard policy for use of social media.