I have used LinkedIn every day for a decade at this point and am one of the top activity generators. Recentlly LinkedIn has begun charging more and limiting access, now cutting you off if a % of users don't respond to your InMails to them within a finite period of time. LinkedIn has made a mint off me and my clients as I teach internal recruiting firms how to best use social media, sites, and other tactics. At this point it seems LinkedIn has become way too full of themselves and I for one will stop using their service and recommend my clients stop using their services, so I'll stop the flow of cash - if they cut me off from communicating to users of the system. Such a subjective way of quantifying responses - some that I InMail I'm certain don't even have their email address hooked up to their LinkedIn profile so that's why a large % don't respond. And, those who don't respond today, usually respond in the future - keeping my name on file - it's happened and it's real. Stupid people making these rules do not understand their own business! Does anyone have a different LinkedIn type service yet? Can't wait for it to come about - users will mass exodus...