* 2012 hack. 6.5M unsalted SHA1 password hashes leaked [1]
* 2013 Acquires Pulse, forces existing users to create a LinkedIn account. Users are pissed [2]
* 2013 LinkedIn Intro. In case you missed it, it was an iOS app that changed your mail settings to proxy your incoming mail through linkedin's servers in order to inject a frame with business-card-like CTAs. In the meantime, this naturally gave them instant access to all your emails. Massive privacy implications.
* 2013 LinkedIn Intro, 3 days after release. Jordan Wright shows a CSS-based phishing attack: security implications as well [3]
My personal experience with LinkedIn:
* My profile info is available to premium users without my consent
* Premium users can spam me without my consent.
* "Who viewed your profile" feature. Unbelievable.
* Constant contact requests from random people. I can't turn their email notifications off entirely (introductions are mandatory). EDIT: I was mistaken - <sarcasm>the process is very straightforward [5]</sarcasm>
* They seem to be in the business of intentionally misleading people (2011) [4]
So, personally I'm the furthest you can get from being a fan and I can't imagine what you were a fan of. They're top ranking on my shit list.
[1] http://blog.linkedin.com/2012/06/06/linkedin-member-password...
[2] http://www.theinquirer.net/inquirer/news/2306932/linkedin-in...
[3] http://jordan-wright.github.io/blog/2013/10/26/phishing-with...
[4] http://www.michielgaasterland.com/online-reputation/try-link...
[5] http://www.businessinsider.com/how-to-disable-all-of-linkedi...