Do my followers need to register with Chirpify to buy?

Yes.
 
If they haven't yet registered and they try to buy, Chirpify will notify them to sign up. 
On Twitter, we will send an @mention.
On Facebook, we will comment back on that thread.
On Instagram, we will comment and tag the username directly in the comments area.

You can streamline this process by posting one or two posts in advance, telling users to register with Chirpify so they'll be able to quickly buy when products are posted.

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