I am posting images daily to some communities. With the months I'm loosing track of what was already posted by me and others.
So does someone know a service (preferably a website) where I can input a image or link and see in which communities and when it was posted?

Edit: Well, I should have clarified from the beginning my intention behind this question.
I was thinking about creating such a service. So I wanted to know if similar already exists (and so save me the effort of development). Also I wanted to sample from the comments if there is interest in such a tool.

Current result: there is no such service but reposts are not really to worry much about.

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[–] schnurrito@discuss.tchncs.de 4 points 2 days ago

For a link, you'll see it after posting if it appears in the list of places the link has been crossposted to, at which point you can delete it.

An image, that is more technically challenging because it requires detecting whether two images are the same, which is not as trivial as it sounds. But for images, I think reposts are no big deal anyway, many people will not have seen it the first time.