Thank you for your input. I am still contemplating about this. On one hand, I want to be able to limit spammers from signing up freely, but on the other hand,

Thank you for your input. I am still contemplating about this. On one hand, I want to be able to limit spammers from signing up freely, but on the other hand, it's the reason you just mention. I am still on the fence here. Once I opened up a fake page just to test out and within 24 hours, I got many spammers signing up for no reasons.