Ask HN: Could you run your startup from China?

Every time China blocks another website I get a little uneasy about the prospect of moving to China and running a software business from there. I love being in that country & sure, a VPN helps out, but the political/business implications make me uncomfortable.

I've been making this little mental list of 'minimum requirements' of products/services in order to run a business. Currently the google/twitter/facebook triad from that list has been blocked. I used to fear the day that more essential services would be blocked. That day came yesterday (Dropbox).

So, which are the products/services your startup can't live without? Which websites, when blocked, would hurt your business?