Why an iDevice? Does Android add periods by default? (Space space doesn't on most Android devices, neither does Enter enter).

He could have written this on any mobile computing platform.

That being said, he did use short hand texting "speech" with his "w/".

Quick test on a text field in chrome on my Galaxy Nexus shows the same behavior listed above: two spaces automatically ends the sentence with a period, but two carriage returns does not.

Presumably if he was adding periods manually, he wouldn't have skipped them at the end of paragraphs.

That seems like a fairly sever oversight. Is there a reason for that behaviour?