I don't use linkedin. Fuck them.
Neither do I.
I used to keep in touch with friends over Skype, but when Microsoft bought and disolved into LinkedIn I immediately deleted it. Everyone I know did the same.
I refuse to use any M$ services if I can get away with it. They've outright stolen code from github users and told them to fuck off when they got caught. I won't even use the local github server that is supposedly "secure".
Oh yeah, They also absorbed GitHub and turned it into malware HQ.