I am going to invent a social network that allows only me as its member. It will be called PhilSpaceSterBook and I will spam the hell out of myself with friend requests, event announcements, and invitations to play the game PhilVille.
The network will allow me to keep track of all my developments and tag myself in embarrassing pictures I wasn't aware existed. I will most likely unfriend myself due to my abuse of PhilSpace, and may even report myself to administrators.
I'm hoping this thing takes off and allows me to cash in for millions or even billions. But before that happens I will be sure to screw over my partner, who of course is also myself, forcing him to sign over all his shares to me. Eventually I will probably sue myself because of this cruel betrayal, but I will be able to pay myself off with a settlement and resume making more and more money with ads and whatnot.
Anyway, I'm taking investments, so let me know if you want in.