You can check the whole discussion on webmasterworld, it’s recommended.
Unfortunately there are all kinds of devious server hacks making the
rounds these days. They usually depend on two factors: sites that use a
common CMS (such as WordPress) and site owners who do not update their
software to keep security solid.
But the average site owner may not have the resources or
understanding to investigate thoroughly. All they know is that their
Google traffic went away.
But if you can discover that you’ve been hacked, the fix is straightforward:
fix...
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