Back in June, I decided to put my money where my mouth is and buy $1,000 of Facebook stock. I got 30 shares for roughly $31/share and, as history now shows, FB promptly tanked to $17.73 in the following weeks — costing me nearly $400 on paper. The stock has since rebounded a bit to ~$24, but I'm still hundreds of dollars in the red.* So how do I feel?