Think you're brave, internet tough guy? Ex-Google China chief Kai-Fu Lee's been rather outspoken about censorship in his homeland, and as such was banned from Sina and Tencent Weibo for three days, presumably by over-zealous authorities. To keep his followers in the strictly monitored nation up-to-date, the Beijing-based Lee took to Twitter and invited all 30 million of them to join him, which would make him the social network's fourth most-followed user. That's unlikely, of course -- Twitter can be accessed fairly easily despite a ban in the nation, but developing a country-sized following on an illicit site would be a stretch, even for an outspoken pundit.