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How can I check if something has been posted before, to avoid double posting?

The New Post form will automatically check for you. Just enter the URL and click "Preview."

For better searching, leave off everything but the domain name -- no "http," no "www" and no directory or html suffix information. This makes it more likely the search will catch a double.
You can also plug a URL into the Search box on any page, or search in Google by pasting the URL into Google along with this string: site:www.metafilter.com
(tags: ) January 25, 2013 - back to questions