I created a Facebook account back in 2008, as part of the 23 Things On A Stick exercise. And I have to confess, I haven't accessed/posted to it for the last five years or so -- I used it mostly for posting photos of my growing family of cats. I realized that the types of social media that Facebook and Twitter represent -- with the constant posting, updating and sharing, wasn't me. I found I just did not have the time that was needed to keep up with all of the activity. On the other hand, I will say that Facebook is a great way to keep up with friends and family who are distance (my husband keeps up with nieces that way).
If I ever created a Twitter account, it has long been forgotten. I do know that the Twitterverse is very active, can be influential in creating social movements and providing a finger on the pulse of popular opinion. My institution does use Twitter for events and other announcements and finds it very successful in getting the word out.
So, I did sign up for HootSuite -- so I do have that in place, linked to my Facebook account, in case I ever get back into the whole social media arena again.