I suppose you have heard about it already (OpenSSL bug, if you haven't just google it in your preferred language and you'll get plenty of results).
Github was affected too:
https://github.com/blog/1818-security-heartbleed-vulnerability
they suggest:
I suppose I have to do that, right? meh...
came up in a pub quiz I was at last night my team was only one to get it correct :D
I'd think so. Before sites closed the hole it was amazing to see what you could get from the server memory and with almost no effort. I guess the real issue is, no one really knows how long it may have been exploited. The issue was around for, what 2 years, and if anyone knew about it they could have amassed quite the tasty mountain of info.
Awesome :D
How can we find if a site is affected or not. Any simple way like putting our URL as in Google PR check ?
You can use https://filippo.io/Heartbleed/ and enter a URL to see if its effected. Most of the large sites fixed it within hours of it being published. There was a running list of the top 1000+ sites for vulnerability published which put some extra pressure on them to plug the hole. :P