Rankerx - need advice

- Which diagrams in Rankerx has the widest reach in terms of number of postings?
- If my niche is senior healthcare, 50 articles (with spin), run 5 diagrams, will these tier-1 (mainly 2.0 blogs) have duplicate postings?
- If so, how to select diagrams so as to avoid duplicates?

Thanks

web 2.0 + social bookmark diagram usually has the widest platform pool, less overlap risk than the smaller niche-specific ones