Actually, Linkdein is not a very popular social media in my country, but since I'm a performance marketer, I post a lot of things I've learned in my work and share my thoughts.
If I have an impressive project, I also update my experience.
I use it mostly for networking. If I need to contact with some executives or potential partners that we can use for our product, I contact them via LinkedIn.
I use them for early signups for any app, because these people already trust me I don't need to do as much convincing or prep as I would need to for somewhere like Product Hunt
Alpha Chart