Google Panda Update Version #24; 1.2% Of Search Queries Impacted: "Google has announced a new Panda refresh, making this version number 24.
This refresh has a noticeable impact 1.2% of English based queries according to Google.
The previous confirmed update was #23 and it impacted 1.3% of English queries on December 21, 2012. Prior to that was a refresh on November 21st that impacted 0.8% of queries. It seems like Google is now rolling out these updates every 4 weeks or so."