An image hosting service allows individuals to upload images to an
Internet website. The image host will then store the image onto its
server, and show the individual different types of code to allow others
to view that image.
Hosting services have the potential ability to identify when and where
their images are being used. When an image file is accessed, the image
host is capable of logging the date and the general numeric internet
address of the request.
In the case of spam, the messages often include unique image URLs that
are specific to that message only. The unique URL is used as a tracking
ID, so that the image host can identify exactly what message intended
for what specific recipient has been viewed, in addition to the date and
host accessing the image. This is why many email reading systems do not
show images by default, to protect the reader from having their reading
of spam being tracked by the email senders.
Different type of Image hosting sites are given below:
11. 4chan
12. Snapfish
13. Fotolog
14. Photo.net
15. Slide
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