It means "I Love You!" in number code. Using the numbers above the first letter of each word. It is useful when you want to say "I love you" in a safe and not-as-awkward way. You just say '896'. If they understand the number code, they should say either:
'8962' or 8965'
If they understand it, but they do not love you, they say:
83696, meaning I do not love you. They can also say: 866, meaning "I hate you."
Guy responds to his girlfriend's last post: 896
Girl responds to his boyfriend: 896 2!!!
Guy responds to his ex-girlfriend: 896...
Ex responds to his ex-boyfriend: 83696!!