Hi Lya,
I hope you’re doing well.
There are plenty of ways. You can for instance integrate Facebook with Klaviyo and create Lead Ads.
More info here.
You can also make a contest on an external app where to participate you have to do different actions (subscribe to your instagram, make a purchase etc..) and you can get email addresses.
I hope this was helpful,
Feel free to send me a private message to schedule a call if you need help or want to optimize your Klaviyo account.
Cheers!
Tom Boeglin | Standard Ecom, agence CRM | On offre l'audit Klaviyo (gratuit, sans engagement). Pour en profiter, réservez un appel ici : https://calendly.com/standardecom/klaviyo | Nos clients : The Bradery, Chloé, JIMMY FAIRLY et +50 autres