Yes, there is too such a thing as copyright on the internet
I was browsing the most recent RPF tinhatter wanks in SPN and One Direction fandom but I barely found it in me to roll my eyes at the crazy. Well, okay, I did. But what really did it was this tangential statement (in the comments at the second link): It's the internet and there's no copyright on Tumblrs. Once you put it out there, it's out there and no one needs any permission to repost anything you've written or created.
WRONG. OMG so extremely wrong. Not that I don't think this is a prevalent view but that doesn't make it better. One quick look at tumblr's TOS confirms:
Ownership:
Subscribers retain ownership of all intellectual property rights in their Subscriber Content, and Tumblr and/or third parties retain ownership of all intellectual property rights in all Content other than Subscriber Content.
You retain ownership of any intellectual property you post to Tumblr.
What you do when you sign up is give a non-exclusive license for others to reblog your content. On tumblr. (See "Subscriber Content License to Tumblr".) You still retain the copyright to your work. (And reblogging content from outside tumblr is in many cases copyright infringement but that's a slightly different matter.)
I'm ignoring fair use exceptions here. The important thing is: internet does not equal public domain.
Man, I feel like I should write that last in all-caps and bold, with sparkles.
WRONG. OMG so extremely wrong. Not that I don't think this is a prevalent view but that doesn't make it better. One quick look at tumblr's TOS confirms:
Ownership:
Subscribers retain ownership of all intellectual property rights in their Subscriber Content, and Tumblr and/or third parties retain ownership of all intellectual property rights in all Content other than Subscriber Content.
You retain ownership of any intellectual property you post to Tumblr.
What you do when you sign up is give a non-exclusive license for others to reblog your content. On tumblr. (See "Subscriber Content License to Tumblr".) You still retain the copyright to your work. (And reblogging content from outside tumblr is in many cases copyright infringement but that's a slightly different matter.)
I'm ignoring fair use exceptions here. The important thing is: internet does not equal public domain.
Man, I feel like I should write that last in all-caps and bold, with sparkles.

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*headdesks forever*
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Let me see if I have a proper icon to convey my feelings on the matter...
alas, I don't.
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I'm not even sure I want to know... I'm annoyed enough at the stuff that gets taken and credited. But if I were to find more than a few uncredited pics I'd consider adding a signature watermark to any new pieces. (And hope that people wouldn't go to the extra trouble of cutting it off. What the hell.)
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For a reverse image search you go to google, then to the image search, and then in the text box there is this little camera icon on the right side. If you click that, there is a pop-up, where you can either enter an URL or upload an image from your hard disk, and then google searches for that image and shows you all the places it has been posted, also different sizes and such. Other search engines do the same.
Ever since that has become available I don't buy people's excuses that "they didn't know the artist" when they just repost without credit. In 90% of the cases when I come across uncredited art, and want to find out where they got it from a one click search gives me the source, though sometimes the original place is quite buried among the copies.
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Ever since that has become available I don't buy people's excuses that "they didn't know the artist".
In their defense, I didn't know either. However it's still not a really good excuse - they could just post a thumbnail and link to the piece where they found it. Or post only a link, if they don't know how to make a thumb.
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In the case of my art, nobody even needs image search, because even before I started to watermark with my URL I signed almost everything except some doodles, with "RatCreature", and my online locations make up eight of the ten first google results for that, including the first three, before even any Bone related stuff which is the comic where I got my pseud from.