Reddit CEO admits to altering user comments that were critical of him

And without an "edited" mark, which means that any comment of any user can be covertly modified by an admin. Very concerning since Reddit comments have provoked even Congress hearings: http://thehill.com/policy/national-security/296680-house-pan...

It's more concerning that Congress is that stupid (one can only hope the Courts haven't been making rulings based on untraced emails and anonymous tweets). Social media is a canonical exemplar of hearsay.

There's a reason Wikipedia isn't an acceptable source in college-level courses.

The reason being Wikipedia is a summary made by a constantly changing group of people out of actual sources with a real name attached to it, which are the ones you're supposed to link.

In any case, a permalink to a specific revision that includes a sha256sum of the article is a good way to ensure you're getting a reliable link to information which can not be tampered without failing the checksum.

If they control the checksum check they can alter it too. Maybe, if you are careful enough to store all the checksums of everything you do online you will be able to tell, but others that see your posts won't even notice.