People keep asking me for the link to my post about Intel's social media employee guidelines (and other examples) so here it is again. Intel's link was actually not working a couple of days ago, so I got in touch with them and they totally fixed it. Awesomesauce!

Their policy guidelines are so good that I have actually cut and pasted them into a Word doc in case the link goes dead again. If you haven't looked at them, check them out. Seriously. Adapt them for your own organization. They very clearly understand the relationship between being authentic, being an actual person, and having professionalism in your communications when you are participating as a staff member.
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