facebook gives you your own little space in the universe. easy to setup your own little webpage chronicling your life. easy to find contacts network with your friends, make new friends. we all want to stay in constant contact with each other..."Where R Y now?" Texting and facebook is an addiction...
Don't think that FB and companies like that stop on their own business. They expand and explore unrelated areas because they have cash. Maybe FB will make its own cellphone, tablet, FB car, FB university, FB shuttle, FB TV channel, FB hospital, FB airline,..... But to answer your question, I will start buying FB at $4.33 and my stop loss is $3.77