I remember it being mentioned in the "Work rules" book by that Google guy. They had a desert in their canteen called "Free Tibet Goji-Chocolate Creme Pie..." in the canteen. They said "well, the food is free, and the berries come from Tibet, so ..." Trying to be cheeky. But several people threatened to quit over this, and they had a huge discussion on the internal mailing list with over 1300 replies. The chef who created it got suspended, and then people got worried because of the chilling effect that this would have on free speech. Eventually the suspension was reversed. Very dramatic.
The Chinese government thinks it could lose the power struggle over Hong Kong, while it was confident about the Chinese invasion and assimilation of Tibet. Hong Kong is a real threat to the Chinese regime.