"posting original stuff to groups with thousands of members and not receiving a single comment or click to some link"
LinkedIn had the chance to build some amazing forums. LinkedIn should be the place that you think about when you want to have a conversation about business. They clearly have the traffic. They could have done something amazing with their groups and discussions. They have wasted all of their chances.
They made a big (incomplete) UI overhaul which managed to make them less easy to use, and half the time fails to load posts (every 1-2 posts as you scroll down is loaded via script, fails a surprising amount of the time, or simply refuses to fire!).
I'm at a total loss as to why they hate Groups so much. Not enough page loads / ad impressions? We run a few groups - ranging from 10L to 90K in size, some of which are quite active. But discussions tend to engage ~.001% of users.
And... I can't forget the fake invitations I receive every week with fake photos that I detect searching on Google images by an image.