Seems to me that FB is dependent upon a generation of people who are attracted to anything new that comes out and will have no loyalty to FB. And, while I have a FB account, I don't visit it often and I don't use my mobile for FB. And, I know very few people who use FB on their mobile (other than those annoying young women who want to give you the play by play of their day). So, if they are dependent upon mobile advertising to grow, I think they are going to come up way short. Just because of the hype, I wouldn't short this stock, but I do think it is going down over time.