I hardly ever swear, only when something aggravates me beyond the point of reasoned debate (which is a Herculean task) and even then I usually only use one swearword strategically placed in order to emphasis how I am still capable of articulate and rational thought, but I am far beyond the point of being diplomatic and reasonable with however I am arguing with.
I swear often online, but even then I steer clear unless I'm trying to emphasis, because in a text-based argument you can't use tonal shifts in your voice or pauses for emphasis, so you have to resort to other methods, and a well placed swearword can be the best way to do that.
I also put wear words into my written works (stories etc) when it is character appropriate.
The one exception to this rule is Emma Watson, who I will curse out every time I mention her name. *****.