You are a social media glutton if you try to be everywhere at once. You feel the need to create an account on every social network in existence, regardless of whether or not the network is appropriate for your specific goals.
If you do not know what your social media goals are, start by asking the following questions. Does your target audience use the social network? Do you produce content that the social network can showcase appropriately? What results are you looking to see from being on the social network (i.e. leads, website traffic, exposure, etc.)? Answer these questions for each social network before actually creating your account.