I have been suffering from a known bug of tweetback plugin of wordpress for a week.

Tweetback Counter does not update its count if a tweetback is deleted in the admininterface or database

update wp_postmeta set meta_value='0' where meta_key='tweetcount';
update wp_postmeta set meta_value='a:0:{}' where meta_key='twittercomments';

I executed the above sql and fixed the post page errors at least
but left sidebar still shows wrong number of comments

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