Terraform is running a single story a week, at an excellent 20c/w, for fiction up to 2,000 words:
Submissions for Terraform are open to the public, and the ask is simple: We're looking for 2,000 words or fewer—a nice, digestible internet length—of speculative fiction honing in on the tech, science, and future culture topics driving the zeitgeist.
We're looking especially for nearer-future fiction; think a bit more along the lines of sentient chat bots or climate-changed dystopias and less far-flung alien space operas. And we don't care what form it comes in: Classic-style SF short stories, social media posts from beyond the horizon, fictive data dumps, experimental graphic narratives, and so on.
Read the guidelines here: http://motherboard.vice.com/read/how-to-submit-stories-to-terraform