Because there are still financial incentives for spammers to operate on Facebook, their techniques continue to advance in order to avoid detection. They operate "farms" by making a lot of phony accounts, frequently with the use of automated technologies or big crowds of individuals, in order to get a lot of followers on pages that they subsequently sell to other spammers for a profit. Additionally, spammers use hacked legal accounts and are always coming up with new strategies, so Facebook's moderation team finds it challenging to keep up with all the scams.