You can click to access the list of all the possibly affected sites. But before signing off any site as ‘vulnerable’, we recommend that you check their respective blogs for the latest updates. There is no way of telling how many sites out of the list were actually attacked as the bug leaves no trace of any attack carried out on the site.

https://github.com/musalbas/heartbleed-masstest/blob/master/top1000.txt

Thankfully, names like Google, Amazon, and Microsoft have not yet found their way to the list.