Add UTM parameters when publishing?

Does anyone know if there is a way to add UTM parameters (Campaign Source, Campaign Medium, Campaign Name) to a post when you originally publish it. I want to get an idea of which social media sites are getting me the most traffic so I know where to focus my efforts. I do see quite a bit on Google Analytics from Facebook, but I know I have more Twitter followers than Facebook followers so I want to see how many (if any) of my views labeled as Direct are actually from links that get sent to Twitter. Is this possible or would I have to remove the automatic Publicize and manually create a custom link with UTM parameters and then share them on Twitter and Facebook every time I make a post (which is doable, although time consuming)?