In a way LinkedIn is federated. You create a profile or post, and within minutes hundreds of shady data brokers and contact details resellers have a copy of your post available for their customers!

I don’t really see the benefit, though. LinkedIn is functionally almost the same as Facebook, and can be replicated by adding a theme to a Friendica instance with a few custom fields. The biggest difference is that LinkedIn allows recruiters to spam and stalk youoffer you jobs, other than that it’s just Facebook where most adults have decided to only talk about work stuff.