User security is a major concern and responsibility.
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Ok, Let's get to the point:
Our server deletes all file as soon as it's expired.
We specifically don't use Ads for 'ShiftDelete' contents (We've ads in our other pages) so that 3rd party advertiser cannot track your browsing info.
We don't track your info with cookie, script or any automated tools
Although your posts cannot be downloaded by other viewers but be aware that there are always a risk that your content can be downloaded by either third party add-on or simply by screenshotting!