Gitelman's survey of web textuality covers a wide range of effects that can occur to texts embodied in digital form — especially on the web. She writes:
And since metadata are precisely "meta-," their revision process reflects an author's, editor's, or programmer's ongoing reinterpretation of the data in question. [...] And once the machine is running, it becomes all but impossible to experience Web publication as a bounded event within a punctual discourse.
I'd like to demonstrate this point. You might think that the words you posted here are your own, safe from editing and revision on the part of others. But your words are not safe. This is not a gated community. There may be bad apples in the bunch. At any moment, say, a small army of Lolcats could run over your carefully crafted prose... (Thanks for the inspiration, Schuyler.)