Aminus3 currently has a community page, which shows some of the photos posted for that date. At the bottom of that page you can select to see all photos posted for that day. It displays them as thumbnails and then you can click one to see it on the individual's site.
If you know one that you are looking for you can use CTL-F to bring up the find dialog box and enter the display name associated with the site to find their picture, such as entering bonj. If you are on the page for all photos posted for the day and you don't find the name you are looking for, then the person has probably not posted a photo for that date.
You can only post one picture for each day, but you get to pick the date. If you upload one for a future date, it will not be visible per your site or the community list until that day comes. If you post to a date in the past, it will show on your page, but as the date has past, it won't make it on the community page.