The functionality that linkedin has is sufficient in my opinion. It is the way in which people use it that has decreased its value for me. It has simply become a B2B/P2P marketing platform. Ultimately things like FB, Linkedin, etc... will fade out due to it not being focused enough.They will keep generating ad revenue, HR, sales/marketing departments but there will be better solutions for professionals. I think over the next several years there will be industry specific solutions that prove to be more effective.