There are three ways to submit new content to The Photo Stream.
Publishers: If you're a site publisher, please submit your RSS feed URL to us. We will automatically check for new content every few minutes and posts will be imported (and might appear on our homepage on a regular basis). Make sure you include images in your RSS feed descriptions -- currently, we need that to import your posts.
Individuals: If you found something perfect for The Photo Stream and would like to submit individual URLs, you can do that here:
Old School: You can always email us. Make sure you include an link url, image, title, and caption.