Social media platforms are subject to change. Rules on content and timeline algorithms are regularly evolving. As Social Media Coordinator for a large Raleigh-Durham-Research Triangle Park professional organization since 2014, I've seen a few shifts on LinkedIn that affect content effectiveness.
Pin to the Top
An option is to delete new posts which I hesitate to do unless the post is completely irrelevant to the group's interests. I've contacted a frequent poster who is promoting his Texas-based podcast and asked he hold up on posts until our annual conference is over. I wanted to make sure the conference post stayed "at the top."
New Member Requests
1. No pin to the top feature
2. No emails communicating group post topics
3. Changes in new member requests