<3 is a little sideways heart, to express love. Usually used ironically in response to a bitchy joke, or in apology for making said bitchy joke. Variants include </3 for a broken heart, <$ to convey a financial motive for love, and <4 as the superlative of <3.<4 is just brilliant. Link
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.