According to their website, AllVoices.com is "an outlet for anyone to contribute news, videos, or photos from anywhere in the world, via computer or mobile device."
Of course, if anyone can post, there's the issue of credibility. AllVoices has addressed that in a unique way. This article from Reuters explains:
"Contributors are free to post almost anything. Credibility is rated by people who read postings and by the in-house algorithm, which is designed to help measure postings against traditional media and other sources."