The internet is a strange place. In a sense for data and informations, it is either there or it isn't there. Researchers found that photos uploaded to some social networking websites or photo sharing websites maybe there forever. While the option to delete them is there, somehow the data remains, for some cases. The reason is because several websites uses multiple servers to contain the data which would take some time for the purge. So that is good news in case something went down you won't lose your data. But now that you wanted the data gone that is a possible challenge. Some people might even duplicate your data to some other websites where you have no control. There are also caches from search engines so unlike your local data, If they are removed, there is a 10% you will see it again.
http://tech.yahoo.com/blogs/null/142366
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