What is "公知"? It's the so-called opinion leaders in China's Mainland. Attached below is the part one of a series of 14 sharp-pointed critiques published in Sina Blog. You are able to read the others because all of them are serialized, one after another.
P.S. Now you've understood what the term "公知" is. Looks familiar? You bet! You can easily find a lot of Taidu/Dutai "pundits" on TV here in Taiwan. I believe those "pundits" are of even lower class in knowledge than their counterparts in Mainland, though the peril they've brought to the societies might be the same.