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sharing around with people on a forum I think is fine if you trust them. as you say you still have the original subs.
if someone has spent mega hours on a project or captured a rare event I can understand why one may upload a reduced dimensioned jpg (but not something that is tiny!).
flickr compresses images a lot these days as far as I am aware.
funnily enough I have had one image go viral on the web with millions of views, my brother in law posted it to imgur and then it was gone.
it actually ended up having memes made from it. but it was kind of nice seeing that millions of people had seen it. I didn't think much of it at the time mostly because it wasn't a deep sky shot but a photo of Saturn being occulted by the moon taken at the eyepiece with my iPhone. I had way better dslr/scope shots from the same event. I sometimes get people emailing me saying its popped up on another website. i think i would be peeved if it were a deep sky image. but then again i wouldn't put it up on imgur unless it had my details!
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