downgrade to 2.8.6 from 3.0

Version 3.0 is not suitable.. First there was posting tag issue and now when i click facebook share button
A strage code is appearing in the description text area of the facebook
“PDRTJS_settings_1742525_post_13944 = {
“id” : “1742525”,
“unique_id” : “wp-post-13944”,
“title” : “Hum+Sab+Umeed+Se+Hain+2nd+July+2010+-+Geo+Tv”,
“item_id” : “_post_13944”,
“permalink” : “http%3A%2F%2Fwww.zemtv.net%2F2010%2F07%2F03%2Fhum-sab-umeed-se-hain-2nd-july-2010-geo-tv%2F”
}
Hum Sab Umeed Se Hain 2nd July 2010 – Geo Tv”

You can click this link to get the error sample http://www.facebook.com/sharer.php?u=http%3A%2F%2Fwww.zemtv.net%2F2010%2F07%2F03%2Fhum-sab-umeed-se-hain-2nd-july-2010-geo-tv%2F&t=Hum%20Sab%20Umeed%20Se%20Hain%202nd%20July%202010%20%E2%80%93%20Geo%20Tv&src=sp

Please help me with this error or help me downgrade to my previous version..

Thanks