According to Dan Crow, director of crawl systems at Google, Google Tag Library got a new addition of “UNAVAILABLE_AFTER” tag.
That tag basically describe about the content that which will got expired or removed from a site after a specific period of time and that page will no longer be available for crawl.
This tag is highly useful for websites that uses Season Offer Marketing technique or announce some special offers time by time.
Another good use for this tag is making a content public for some time and after a that time make it private or so called PREMIUM CONTENT.
Well the tag is out and its definitely a good addition in Google’s tag library.