Many of us probably encountered it before on a social media like Facebook or Twitter, or in the comments section of a major website. You've decided what you want to say, but you want to stress a specific word or couple of words in your message. However, the medium does not allow you to do what you normally do with the font, like put it in bold, or in italics, or underlined, or in a slightly larger font, or in a different font. The only things you can do is use printable characters you can make with your keyboard. One of the most common solutions people thing of is using letter casing, but that can quickly devolve into "why are you shouting at me?" and isn't always suited.
When in such a situation, what method can bring across the best impression of a stressed syllable/word/word group without offending people? And does this method depend on the type of stressing you want to give the word (pitch vs tone vs volume)?