Of course you can be censored by non governmental institutions. Where on earth did you hear only the government can censor you?
This is from wikipedia:
Censorship is the suppression of free speech, public communication or other information which may be considered objectionable, harmful, sensitive, politically incorrect or inconvenient as determined by governments, media outlets, authorities or other groups or institutions.
I’m officially through with this debate. It’s basically been a long string of illogical, angry, nonfactual arguments against the obvious and unpleasant truth that it’s ironic for this site to censor people. We love to examine Facebook’s policies, but it’s ok to shut people up here for saying something unpopular. It’s censorship, Boingboing editors are free speech advocates, and that’s all there is to it.