The hacker group known as Anonymous released a file on Friday containing about 13,000 passwords, it claims.

The stolen account information was posted to Internet file sharing site Ghostbin.

That's not the biggest password leak we've ever seen. With millions of passwords in use for sites around the internet, chances are, yours is not among these 13,000.

UPDATE: And some people are saying that this hack is fake, that the passwords are fake. Although Anonymous did not claim that it had hacked into any of these sites, Walmart tells us, "the allegations are untrue and Walmart information has not been compromised."

But just in case, be aware that these alleged accounts come from a variety of online sources, Anonymous claims, some of them really popular.

DailyDot's Aaron Sankin sifted through the file and discovered the alleged leaks came from the following sites:

Amazon

Walmart

PlayStation Network

Xbox Live

Twitch.tv

Origin.com

Hulu Plus

Dell

Shutterstock

The file also included the accounts of a number of dating and porn sites, and it appears to have some passwords for a popular security program known as CyberGhost, which protects you from a hacker snooping on you when you use public WiFi hotspots.

Just to top it off, Anonymous also says it posted a copy of the movie "The Interview" making it available for pirated downloads, it said. In an earlier tweet, the group boasted, "When you're a pirate, everything is free."

There are two take-aways from this. 1) If you use any of the above online businesses, watch for unusual activity, although all may be well, if this is just a prank. You can also just change your password now.

And 2) this is another warning that the bad guys are plentiful in cyberspace. So change passwords frequently. Don't use the same ones over and over and if you bank or shop online, always keep an eye out for weird things or unauthorized purchases with your accounts.