Several comments and posts were lost due to mySQL DB corruption for reasons still unknown to me. I have to track all the posts that were lost and the comments and shouts made in the past two days. Some of them I was able to re-port while others (esp. the comments) are in lost forever.
It was partly my fault. I forgot I had an auto-backup plugin which saved all the posts and comments in SQL format so what I should have done was just revert to it. Instead I used the cPanel daily backup from the server which is 24 hours stale. Such is life.
(Update: the /tmp partition of the server was full and caused mySQL cached queries to return an error.)