All major tech firms given same warning to users about Heartbleed Bug. Simply it means that your data stored by all tech companies could be accessible to hackers. So they have issued a warning to change all passwords of online accounts.
OpenSSL is the most popular service used by tech firms to store important data of user which can not be accessible to any one. But now it seems that hackers got access to the secured data and we might see hacking on large scale.