Strikethrough

From my experience:

• It doesn't work in preview mode, so you may have to edit your post a few times to get it right
  
• Wrap the text in two tilde characters (~~)
  
• Do it one sentence at a time, push for an entire paragraph if you're feeling lucky
  
• Do not have a space immediately between the text and double tilde
  
  

Examples:

~~this is text is deleted~~
↓
this is text is deleted

~~ this doesn't work due to a space immediately between text and double tilde ~~
↓
~~ this doesn't work due to a space immediately between text and double tilde ~~