Currently the author service supports Twitter, Facebook, Instagram, Medium, Reddit, Snapchat and Whatsapp. However, it does not support LinkedIn, which would be a useful way to promote authors' work on their professional pages (as well as a potential way to contact them).
Rebecca Zamon
Thank you for submitting this idea! This feature already exists but does not appear to be enabled for your organization's environment. Please submit an ACS ticket with this request and we'll get you hooked up with LinkedIn fields within your Author Service.