We do allow certain swearing words over here but please to the necessary "***" to avoid any major problem. However, it doesn't mean that you can swear all the time, my best advice is to avoid it at all costs.
The Terms of Use says:
You must not use inappropriate language; this includes referencing, hinting at, linking, abbreviating or anything else that may cause offense to others. We allow certain swear words, but they must be kept within reason. Explicit mentions of sex, drugs and violence are strictly forbidden. If you feel the use of a certain word or phrase is needed then blocking out all potentially offensive parts with *’s essential.
Anyway, if you follow the TOU(Terms of Use) you'll be fine. Also, at the bottom of every page you have a link to the TOU, check it to give you a better idea of the rules. Have a nice day. 