Change your password right now - Heartbleed

                 " The Heartbleed Bug is a serious vulnerability in the popular OpenSSL cryptographic software library. This weakness allows stealing the information protected, under normal conditions, by the SSL/TLS encryption used to secure the Internet. 

Change your password right now - Heartbleed

SSL/TLS provides communication security and privacy over the Internet for applications such as web, email, instant messaging (IM) and some virtual private networks (VPNs). "

http://heartbleed.com/

Change your passwords of :

 Facebook
Twitter
Pinterest
Google 
Tumblr
Flickr
Linkedin
Slideshare
Yahoo!
AOL 
Hotmail
Dropbox
Soundcloud

These are the most popular sites and applications. I'd recommend you to have stronger password for all your websites.

Click here How to create a strong password.