Is there something like word or sayings ,forbidden in your countries' websites?

As a Chinese netter,I have a question.
Chinese public website always forbid some words..
such as leaders'names,some words about politcs,or impolite words.. they will be shown as"**" even ask you to edit it again..
We Chinese netters must use other words have the same pronounciation instead to express our minds.it's so inconvenient
does any friends from other nations has the same troubles?
;-P