In the 307th episode of Semantic Mastery's weekly Hump Day Hangouts, one participant asked what should one do to avoid schema markup penalty.
The exact question was:
Question for Bradley… In the past you mentioned getting penalized by spamming your schema. I think my seo guy may be spamming my schema. Can you explain what you were doing exactly that got you a penalty so the rest of us will avoid that. Please?