I don't use "lol" as much as I used to; instead, I tend to use "XD." I use "XD," as my equivalent to "lol," whenever I'm just like, kinda laughing, or chuckling, smirking, whatever. Adding an exclamation mark ("XD!") indicates that I'm actually laughing, and things like "XDD!!" indicate that I'm dying of laughter. :3
Otherwise, "lol" and "XD" don't really mean I'm actually laughing. ._.