You can use a Storage value to keep count and check again, then reset daily.
Zap 1
Trigger: Schedule (Daily @ midnight)
Action: Storage - Set Value (back to 0)
Zap 2
Trigger: Schedule (Daily @ midnight)
Action: Storage - Get Value
Action: Filter (continue if less than 25)
Action: Storage - Increment Value
Action: Facebook Page - Create Page Post
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