Could somebody please explain, as the article seems to completely skip over this point: why should anybody care if people put a #nofilter tag on a filtered photo?
If it were evidence in a court of law and had deliberately been manipulated/photoshopped/filtered etc. to deceive a jury then yes, it's important.
But this is just people's snapshots on a photo-sharing site - not a place where complete accountability is necessary. What does it matter if they mislabel it? Who cares?