Currently the biggest player in the field is LinkedIn platform and it will be very hard to compete them. Is your long-term plan to take them down or to be No.2 Network?? Second option is more realistic.
I am also using LinkedIn and as long as people are happy with it, it would be hard for Skillchain to compete. The thing with LinkedIn is, it takes a long time to get approved.
I'm not sure that LinkedIn will be a sort of competitor. I guess their ideas are different, I believe this companies would co-exist.