Hackers have stolen and posted the usernames and telephone numbers of 4.6 million Snapchat users online. This information was posted on the website www.snapchatdb.info with parts of the telephone numbers and user names omitted or censored, in order to minimize spam and abuse.
A database of the 4.6 Million Snapchat user information is available on the website www.snapchatdb.info for download.
A Screenshot of some of the 4.6 Million Snapchat Users information

The hackers behind this hack have this to say:
"This database contains username and phone number pairs of a vast majority of the Snapchat users. This information was acquired through the recently patched Snapchat exploit and is being shared with the public to raise awareness on the issue. The company was too reluctant at patching the exploit until they knew it was too late and companies that we trust with our information should be more careful when dealing with it.
For now, we have censored the last two digits of the phone numbers in order to minimize spam and abuse. Feel free to contact us to ask for the uncensored database. Under certain circumstances, we may agree to release it."
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If you want to know if your Snapchat account was compromised, you can either download the database from www.snapchatdb.info and search for your user name or telephone number; or you can easily use the following website:
http://lookup.gibsonsec.org/
For information about the Snapchat hack, click here.