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I assume most places like that would strip exif data already.

Imgur does, for instance.

In my opinion, personal blogs are a bigger problem. Even wordpress.com does not sanitize pictures. I believe many bloggers are unaware of that.

They should watch out anyway. This isn't anything that 4chan could theoretically do (although it now has become a lot easier)

4chan retains exif data afaik

Thats what they want you to think

People should strip it themselves (no pun intended)

Pivot.