Ahead of his interaction with Prime Minister Narendra Modi, Facebook founder Mark Zuckerberg changed his profile picture to support 'Digital India'. Within minutes, Modi too changed his picture to thank him."I changed my profile picture to support 'Digital India', the Indian government's effort to connect rural communities to the internet and give people access to more services online. Looking forward to discussing this with Prime Minister Narendra Modi at Facebook today," posted Zuckerberg on Facebook.Within minutes, Modi, who is heading to the Facebook headquarters for a townhall-style question answer session on "how communities can work together to address social and economic challenges" also changed his profile picture to thank him.Zuckerberg's new picture shows his side profile overlaid with the saffron, white and green colours of the Indian flag.Modi's new picture shows his full face with the colours of India similarly overlaid.Modi will follow his visit to the Facebook headquarters with a visit to the Google headquarters.He will also address the India-US Startup Konnect, an event that will showcase the strengths of India's startup ecosystem.