I agree with the point Java script dont think will be helpful here but after reading about the session ID. I feel
When a user visit a webpage a session id is created for that user, By keeping this session id as a hash
session => 'true'
When the user click the Like button for the first time, the session key gets changed to session => 'false'
Now when the user refresh or click back button the session =>'fasle'
remain same and thus further like count can be ignored.
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