It seems that the application is definately NOT made by Facebook.
Reports suggest it is in fact a self-replicating worm that once installed automatically sends a notification to all of your friends saying that you have encountered errors in their profile, and to “Click here to view the errors”..
If they then install it repeats the process ….. and so the worm spreads!
You profile does not in fact have errors on it and is working fine.
It’s unsure what damage the application could do but there is potential that it could collect information about you and your friends from your profile or do any sort of damage to the info you have on Facebook.
I guess it’s likely to be removed by Facebook shortly anyway, but in the meantime …….