The dangers and oppurtunities for an SEO working on link building campaigns in 2016. Includes the only metric you need for backlink campaigns that will generate traffic and real ROi.
20. 20
iFrames for links, yes, they can pass juice
https://www.seroundtable.com
/google-iframe-link-14558.html
http://www.rimmkaufman.c
om/blog/do-search-engines-
follow-links-in-
iframes/31012012/