2015-06-14 UTC
# 
tantek because when you put such burdens on publishers you get a worse UI (too many always visible form fields, compared to Twitter's one simple textbox), you get CRAP for data (e.g. 90210 for zip codes etc.), and you get lots of confusion from publishers who get bad validator feedback about errors in their templates (tons of tweets / blog posts about "required property fn" not found in hCard in google's validator)