Upcado enables marketers to make use of Messenger marketing. It's similar to email marketing but 3-4x more effective. With Upcado you can gather subscribers by creating a list and beautiful opt-in widgets. Once you've gathered subscribers you can send marketing campaigns on Facebook Messenger.
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Gatsby
This has been a really good way to engage with our users and increase our traffic. I recommend giving it a try
Pros:So easy to use. Great design
Cons:Will report back if I see any