Because they are not verifying mail. Mail verification is must for getting credits.
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After login they need to verify mail as well.
They are signing with google mail only
Make sure your friends log in through mail and they will get a mail from tripoto that needs to be verified.
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They need to verify their email id.....they can do that by clicking on the verification link Tripoto sends to their email......
You friends need to piblish their first trip then only you will get credits.
Ya we get credits when any one sign up and post a blog with our link
Sometimes it take a little long. Write your querry to