I just installed the facebook app on my iphone but I have no icon on my homescreens?

It is not on any of my homescreens and it is not in a folders.Id rather not uninstall and re-install the facebook app to save my download limit.

If your iPhone is jailbroken, try respringing it…
If not, simply reboot your iPhone.

Maybe you should refresh your systerm or restart your phone.

Seems your collected apps is corrupted. You should download the app again and try to install it. Before install it, don't forget to restart it.

It will sit on your application, you have to create a shortcut from there to your homescreen.

If its Not Displaying It Probably did not Download Correctly Check your Apps Page In Itunes