Examples

Friend: Dude, wtf, why did you piss in my drink?

You: >:3 (>x3 or x3 are also acceptable)

You: I just love sticky buns. :3

Friend: :3

Girl: Thanks for last night...<3

You: ;3

You: Hey baby, tonight's theme is S&M. >;3

Partner: Oh my. :3

You: <(:3

Girl: omg that's so hawt...<3

Got another situation/suggestion? E-mail me at snibble [at] gmail [dot] com! :3