Facebook and Twitter are internationally recognized brand that are blocked in China... Explaining that away is no problem for the Chinese government.
I think the difference between your point of view and my point of view is that I don't see things as completely black...
China is a repressive government and freedom of speech is not allowed there but it's certainly better than it was during the cultural revolution and I think it'll get better...
Now, as someone who lived in China before Google decided to move in the chinese market I can tell you that it was a great news to see them move... Before they were intermitently blocked by the Chinese firewall, a lot of queries were blocked so access to good search engines was not very good...
After Google moved to China, well they had to censor some of the results out but then they would point it out, and connection and access to google was much better...
So for me, it was a net benefit to see google move in China, and I hope that them moving out won't result in their being blocked again...