EHarmony was apparently also a victim of the same attack.
Security experts blame the success of the attack on the low level of security which the sites were using.
The sites use SHA-1 hash coding, which uses one of the most basic forms of online cryptography.
For most hackers SHA-1 hash is one of the first forms which they learn to hack.
So far no user names have been listed along side of the passwords, so there is no solid threat against users, though they are advised to change their passwords immediately.
Some experts are concerned though as the hack came from Russia, where hackers are known to be expert and enjoy pranks, as well as multiple levels of information release, so the user names could very well be released soon.
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