Mashable, the UN Foundation and its corporate partners are putting on Rio + Social, a conference for those who who use social media for social good. 

As founders of our sister site, Mom Bloggers for Social Good, we knew this conference would be right up our alley as we work every day to change the world through savvy mom bloggers using blogging and social media. 

How do you think social media can be used for good? Do you think it's a waste of time and is inauthentic or do you think social media and blogging are pivital to helping change the world?