Exiv data should not be removed from the posted picture, as it provides others with an option to see how a picture was taken, and possibly to learn from that.
In my opinion, the decision whether or not to include EXIF data in the file should be left to the photographer. If I were not giving out photographs for free, it would be an important tool for me to show that I have the original and own the copyright. Of course, RAW or other digital negative format is just as good for that, equivalent to original film negative.
Tuomas, if you post photographs here in full size, you are effectively giving them away for free. Many camaras still produce jpeg sizes that are well within the site limitations. (I have no idea about toys like phones and tablets, but these I do not consider to be cameras in the first place,
You can also choose to resize a photograph, and post it, and you can still leave the EXIF data on there, as you will have the original full size version.