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CTR - than more than better (on FB).
It depends about
- Targeting
- Interests
- Location (South America [Brasil] and Asia are the most clickable and the cheapest ones)
- Gender (girls are more clickable)
- Product
- Company's type
- Age - people between 13-20 or 50+ also the most clickable
- Advertiser's budget
The question is - what do you want to achive and which objective is needed:
post reach, traffic on website, video views, page likes, offers, store visits.