Google’s “Payday Loan Algorithm” is an update that aims to tackle spammy queries and spam websites that appear in search results.
The uniqueness of this update is that it actually attempts to deal with an area that is usually neglected by Google – queries that are spammier by nature, such as gambling, pornography etc.
According to Google’s initial statement, the update mainly checks for problematic link schemes, so if you were affected by this update you might want to check your website’s link profile.