The Heartbleed bugs is considered one of the largest security vulnerabilities on the Internet due to a bug in commonly used open source software. Now many websites already updated their systems to address the Heartbleed bug. The odds are that the most important websites that you use on a daily basis have already cleaned up the issue.
Sucuri, an Internet security company, has run a systematic scan of the top 1 million websites based on Alexa.com. The top 1,000 websites were updated and are now safe. This includes Google, Facebook, LinkedIn, Twitter, and Wikipedia. There are only 53 out of the top 10,000 websites that are still considered vulnerable according to Sucuri.
Sucuri did not reveal what websites these are. Out of the top 1 million websites, around 2% are vulnerable to Heartbleed, which amounts to a total of around 20,000 websites. If you are concerned about whether a website you use is affected, check out this website to see if it is fixed.