The account you create will represent your department and the College. You must first secure the approval of your supervisor or dean, as well as the Office of Marketing and Communications. (You will need to add a member of the Marcom team to your page administrator preferences. Marcom will provide your site with the brand-aligned avatar.)
(Why are you participating in social media?) Spend time determining what you want to accomplish on social media. Follow others similar to you. Define what you do and do not like. This understanding will serve as a basis to define your own identity.
Once your site is up and running, you will find some content is popular, some is ignored, and some is just plain cumbersome. All social media tools come with easy-to-use tracking tools, so you can see which posts are viewed and shared most, which generate comments, etc. Be prepared to re-align your strategy in response to who is viewing your site and how they are doing so. What statistics are meaningful to you (number of hits, attendance, page likes, comments, etc.?) What tools will you use to measure success? (Hootsuite, Sprout Social, bit.ly, Facebook insights, etc.)