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If you are looking for a RSS feed for your site which will supply jokes, you can simply use the feeder available.
Random Jokes Feeder link: http://freesms.parijat.biz/jokefeed.php
You can use a RSS reader to feed this information to your site.
A simple use is being done on Funtelya website
No Problem, we got you covered. You can use the link http://freesms.parijat.biz/randomjoke.php in you site to get the content. You may need to include this link in your site code to retrieve the information. example shown in PHP