Why are there 4 threads about the same thing on the main news page?

https://github.com/rails/rails/commit/b83965785db1eec019edf1fc272b1aa393e6dc57

http://homakov.blogspot.com/2012/03/im-disappoint-github.html

http://homakov.blogspot.com/2012/03/egor-stop-hacking-gh.html

https://github.com/blog/1068-public-key-security-vulnerability-and-mitigation

I have no idea if these will post properly.