I posted my first comment on LinkedIn this morning. I responded to Preet Virk's visual of the Photonic Fabric slide from his presentation that was posted on LinkedIn 3 weeks ago. Instead of a thumb up, I used the light bulb icon because it was insightful:
https://www.linkedin.com/in/alex-threlkeld-84818b2a5/recent-activity/comments/
Profile: https://www.linkedin.com/in/alex-threlkeld-84818b2a5/?originalSubdomain=ca