Please answer chicks and dudes!!!!!! ibeg you. girl troubles?

i like t|his girl. we only chat on facebook. she prefers it this way. we seem to get on fine as friends. she seems a bit shy, yet confident with her friends. she doesnt send me any spontaneous messages. i send her and replies. she uses the 'awww' and 'ha ha' and 'lol' expressions alot. i have complimented her on the way she looks but she hasnt complimented me. should i pursue her or give up?