The gender ratio is a problem in India - due in part to illegal sex-selective abortions, female infanticide, neglect and discrimination against girls in some parts of the country.
The hashtag #selfiewithdaughter began trending on Twitter, after a village in Haryana state - which has one of the lowest ratios - asked people to pose with their daughters in a selfie contest.
Indian Prime Minister Narendra Modi called for people across the country to join in and share pictures taken with their daughters.
Thousands are now posting selfies online with messages about why their daughters are their pride and joy.
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