***Not meant to step on anyone's toes. Really just wanted to get this out here so that everyone could finally enjoy!!! Mods delete if this is redundant.
To get FB push notifications working here are a couple of things you can do:
Get a Blackberry device. Any one will work that has the FB app. If you don't have access to a BB you can download a simulator from BB. Go here to get your BB simulator. I went with the Storm II since I looked at one a long time ago when I contemplated my switch to a Droid. Glad I never went with BB lol. In order for the simulator to work on your PC you will need the Java Dev-kit which can be downloaded directly from Java or just click here
Install the Java first and then run the installation for BB sim. I have Win 7 and it took me less than 10 min total for both.
Once you have everything installed go to your Facebook app on your Droid and clear cache and data and logout of your Facebook app. I know you will lose everything, but you will get it all back in just a moment along with NOTIFICATIONS!! Launch the BB simulator. Once the mock phone loads on your PC launch the Browser on the BB simulator and point it to facebook.com. It should give you a suggestion to download the app for Blackberry. Click the link and follow the instructions and in moments you will have the FB app on your BB. Once the app is done installing login with you credentials. Once you login accept all permissions. I even selected to remove email notifications within the BB Facebook app so I could see that it worked. I also made a status update just to see if FB in fact recognized my update and sure enough it said Facebook for Blackberry. If you have a physical BB you probably don't need to download the app so you could just skip that step.
Now go to Facebook.com from a PC and go to Account Settings. On the left hand side go to Notifications. Scroll down the page to where you see other Notifications. Click that and there you should see Facebook for BlackBerry® smartphones. Clear the checkbox and hit save, then add the check back to the box and hit save again. Now logout of FB for the BB sim and shutdown the sim. Go back to your droid and login to your FB app. Select whatever you prefer for syncing your contacts and then go to Settings and make sure that notifications are set to active(checked). The refresh interval has nothing to do with notifications, its just how often do you want the app to refresh the newsfeed in the background. I have mine set to never. Everything is now done and should be all set. Whatever you do, DO NOT DELETE THE Facebook for BlackBerry® smartphones application on Facebook or you will have to do this all over again.
Works like a charm. I now get notifications immediately for chat, comments, mentions, messages. They all come through perfectly. In most cases I get them faster than I do on the Browser for the PC.
If and when FB gives us another app update you may need reset the permissions for the notifications again. Just login from a PC and go back to your Account Settings ---> Notifications ---> Other Applications and uncheck the BB box and hit save recheck and hit save and all is well. I had to do that with the most recent update, but everything still works flawlessly.