why. participants were assigned to a group that exercised or didn't exercise. it increases metabolites that lower breast cancer risk. pretty astonishing show of force from social media in the immigration debate in what's being called a political thunder clap, a flood of tweets and facebook posts reach moed more n 45 million people last week. they launched what they say was the largest ever virtual march for immigration reform. even senator chuck schumer got in on the act, putting out a seven-second clip, his first ever vine video. >> seize the moment. pass our immigration bill. great for tech. great for america. >> i'm joining by social media skpeft and co-founder eric. it's always great to have you. >> it's great to be here. thank you. >> a twitter town hall that was led by arnold schwarzenegger,