Not sure about Linked In, though it's good for search engines by the looks of it, but I do know of one or two who have had work from Ecademy. I'm pretty new there myself so still testing it out.
Helping business owners with every day advice, tips and discussions with likeminded business owners. Become apart of a community surrounded by level headed business folk from around the UK
I have to agree with Gordon. LinkedIn and Ecademy and any other such networks are all part of the whole Web 2.0 Social Networking scene. As Gordon says "the chances of making money from these platforms is very small" and I think this is where people make the mistake. I was a victim of that to originally joining and hoping I would get plenty of referrals and business from it but then soon realised that wasn't happening and whilst initially I was put off by this it dawned on me that Networking is not all about making money it is about building useful relationships for the future. Someone I meet on LinkedIn or Ecademy today could be instrumental in a year or two so it is worth keeping the relationship.