QUESTION.!!!!! PLEASE HElP.....?

Ok so what do you do when you haven't seen or talked to a person for four years. And then... you find them on myspace and your like heeey its ___!! and then their like heey whats up girl? What do you say? Like obiously a lot has happened in 4 years. What do you say like thats happened a lot now cuz im finding my old buddies from cali.