I don't think its possible to log into 2 different accounts on the iphone, I also play it on the ipad and that works fine on multiple accounts as long as you are logged into facebook on the account you want to log into.
YES.
Finally sussed it out, I had to change my facebook log in on the settings page.
Bit annoying having to constantly change it between accounts but its saved me a lot of trouble now!
I don't claim to be a Top Eleven expert but, if anyone would like advice, please don't hesitate to contact me through 'private messaging', I try to reply as soon as possible.