User Name Sieving, LinkedIn Grist
In a tour de force instructional blog post at Black Hills Infosec, Carrie Roberts displays remarkable acumen in the effort to distill user names via Portswigger's Burp Suite, with LinkedIn as input. In the event that you are at all interested in garnering grist for your pentest mill (so to speak), examine - if you will - Carries' commanding work, you'll be glad you did.