By now most people have surely noticed this. Don't worry, they'll be back as soon as possible, but there are some technical problems that have crept into the SBNation platform that are being addressed as we speak.
Fanposts are still available to read and write at the Fanpost tab near the top of the page, so they haven't gone away, they have just been taken off the front page for the time being while the aforementioned technical issues are resolved.
Your patience and understanding are much appreciated.