Those videos, Mr Zhu told us in November, protected him from persecution by the government because they depicted other Chinese officials engagingin sex.
The San Francisco firm said it has dozens of clients experimenting with new ways to make money from Chinese users, including offering free digital content in exchange for engaging with an ad or downloading an app.
In the banquet hall, guests were entertained by a Chinese opera troupe, as Chang drifted happily from guest to guest, engaging them in conversation and making introductions across continents and cultures.