Thats why BB would want access to certain info, # of friends, age and activity.
People would be reluctant to cheat on an account linked to their main facebook page, linkage between the two would be troublesome for them to say the least.
Fake facebook though I think is harder than just fake email.
What makes you feel BB users should want BB having access to friends , age , activity? Or that they want to have their BB accoutn linked with their facebook account? If that would be a must, I would either quit buzzerbeater or went a create a facebook account for BB purposes only. Playing BB shouldn't only require registering, having an email to do so, logging in, manging your team and not breking any rules. Period.