NEW DELHI (AP) — New Delhi shop owner Ram Shankar Rai spends at least two hours a day going through political news and videos shared with him on social media.

Rai looked intently at a flurry of videos and photos on WhatsApp about an Indian airstrike in Pakistan, including pictures labeled as militants' corpses.

There was just one problem: The photos were not of militants but of casualties of a 2005 Himalayan earthquake that killed thousands of people in Pakistan.

Tackling misinformation has become one of the biggest challenges for India's Election Commission and social media giants as the world's largest democracy begins going to the polls this week.