Cross-site canonical, does this approach work from an SEO point of view?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

• 
  Max Poliakov: Hi Ian! There can be 3 options, actually.
  1. Implement meta robots noindex,follow on every page of IYH copied from IYT. If the copied articles get any links they'll pass link juice to other IYH's pages via internal links.
  2. Use rel="canonical" on IYH so that they pass the link value to the original publications.
  3. Block copied pages in IYH/robots.txt. In this case nobody gets anything :)
  
  Hope it will help.
• 
  Ranu Jain: As you wrote that "Some of the content from IYT would be a good fit for IYH yet remain valid for visitors to IYT.  ;So IMO, you would not want to move the content from IYT.
  
  The other thing that can be done is prepare a snippet/ gist of your old content; post on IYH and give a link to IYT saying read more about it or by related keyphrase.
• 
  W.E. Jonk: Not sure if this is the case, but it sounds like you have a site in a particular niche but some content on that site would be better served on a different closely related site. For example you have a site about SEO but frequently you post stuff about internet marketing. Although SEO and internet marketing are related it might be better to separate it into two different sites.
  
  If that is the case then I would 301 the articles to the "new" site. With a 301 you tell search engines that the content is moved permanent to a new location. So I wouldn't use robots.txt, noindex or the removal tool because Googlebot has to crawl and see the 301 and thereby transfer the traffic to the new page.
  
  Makes sense or did you mean something else?