Does He Like Her?? Options

[DirtyPrettyThing...]

Well my friend is really in love with two boys (they are twins and one of them gives out more signals and looks at her etc more than the other one) and she has been for a while. She's really making herself stressed and upset over them and I hate to see her like this...
She sees them everyday on the bus and has left a comment on one of their Bebo accounts and even though he's been online he still hasnt replied. He gives out mixed signals on the bus too - sometimes he looks at her, sometimes he ignores her, sometimes he sort of looks at her and looks away. What does this mean? This is also a question for if you're a boy....what do boys mean when they give out mixed signals like this?? My friend is really stressed and doesnt know what is going on and whether he likes her or not.