An encryption flaw called the Heartbleed bug is already being called one of the biggest security threats the Internet has ever seen. The bug has affected many popular websites and services ones you might use every day, like Gmail and Facebook and could have quietly exposed your sensitive account information (such as passwords and credit card numbers) over the past two years.

But it hasn't always been clear which sites have been affected. Mashable reached out to various companies included on a long list of websites that could potentially have the flaw. Below, we've rounded up the responses from some of the most popular social, email, banking and commerce sites on the web.

Some Internet companies that were vulnerable to the bug have already updated their servers with a security patch to fix the issue. This means you'll need to go in and change your passwords immediately for these sites. Even that is no guarantee that your information wasn't already compromised, but there's also no indication that hackers knew about the exploit before this week. The companies that are advising customers to change their passwords are doing so as a precautionary measure.

Although changing your password regularly is always good practice, if a site or service hasn't yet patched the problem, your information will still be vulnerable.


Social Networks
Facebook:
What it Affected - Unclear
Is There a Patch - Yes
Change Your Password - yes

Linkedin:
What it Affected - no
Is There a Patch - no
Change Your Password - no

Pinterest:
What it Affected - Unclear
Is There a Patch - Unclear
Change Your Password - Unclear

Tumblr:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - yes

Twitter:
What it Affected - Unclear
Is There a Patch - Unclear
Change Your Password - Unclear

Other Companies

Apple:
What it Affected - Unclear
Is There a Patch - Unclear
Change Your Password - Unclear

Amazon:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Google:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - yes

Microsoft:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Yahoo:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - yes

Email

AOL:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Gmail:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - yes

Hotmail/Outlook:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Yahoo Mail:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - yes

Stores and Commerce

Amazon:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Amazon Web Services:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - yes

Ebay:
What it Affected - Unclear
Is There a Patch - Unclear
Change Your Password - Unclear

GoDaddy:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - yes

Paypal:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Target:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Walmart:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Banks and Brokerages

Bank of America:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Capital One:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Chase:
What it Affected - No
Is There a Patch - No
Change Your Password - No

E*Trade:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Fidelity:
What it Affected - No
Is There a Patch - No
Change Your Password - No

PNC:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Schwab:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Scottrade:
What it Affected - No
Is There a Patch - No
Change Your Password - No

TD Ameritrade:
What it Affected - No
Is There a Patch - No
Change Your Password - No

TD Bank:
What it Affected - No
Is There a Patch - No
Change Your Password - No

U.S. Bank:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Wells Fargo:
What it Affected - No
Is There a Patch - No
Change Your Password - No

Government and Taxes

1040.com:
What it Affected - No
Is There a Patch - No
Change Your Password - No

FileYourTaxes.com:
What it Affected - No
Is There a Patch - No
Change Your Password - No

H&R Block:
What it Affected - Unclear
Is There a Patch - No
Change Your Password - Unclear

Healthcare.gov:
What it Affected - Unclear
Is There a Patch - Unclear
Change Your Password - Unclear

Intuit (Turbo Tax):
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - Yes

IRS:
What it Affected - Unclear
Is There a Patch - Unclear
Change Your Password - Unclear

Other
Dropbox:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - Yes

Evernote:
What it Affected - No
Is There a Patch - No
Change Your Password - No

LastPass:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - Yes

Minecraft:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - Yes

Netflix:
What it Affected - Unclear
Is There a Patch - Unclear
Change Your Password - Unclear

OKCupid:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - Yes

SoundCloud:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - Yes

Spark Networks (JDate, Christian Mingle):
What it Affected - No
Is There a Patch - No
Change Your Password - No

Wunderlist:
What it Affected - Yes
Is There a Patch - Yes
Change Your Password - Yes

We'll keep updating the list as new information comes in.
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