In order to add your copyright information when importing images into Lightroom you can create a Metadata Template.
This Metadata Template can also be used to add your copyright information to images already in your catalog. Social media sites such as Flickr, Google+ and 500px preserve this information. Sites such as Facebook, however, strip the information from your images. If you are concerned about this I advise posting to a site that preserves the information and then posting a link to this image on Facebook.
One of the topics I can cover during my one-on-one training sessions and workshops is how to optimise and automate Lightroom in order to create fast and efficient editing workflows.