Should I check the rel nofollow box?

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

• 
  Marilyn Lesniak: I have a food blog. After every recipe I put All images & content are copyright protected. Please feel free to use my images and recipe for your own use. To republish this recipe, all I ask is to link back to this post.
  My blog name is first and I add a link. Is this good or bad? And should I check the rel nofollow box? Thx
• 
  Edwin Jonk: I guess you use Common Creative [1] for your images. Because Common Creative states that one should give attribution [2] it will be more likely you get a link.
  
  For Google to understand the image is Common Creative you can mark it up with rel licence and the about attribute [3].
  For example:
  
  <div about="url_to_my/greatimagfe.jpg"
  <img rel="licence" src="url_to_my/greatimagfe.jpg">
  <a href="url_to_the_licene">CC</a>
  </div>
  
  This way you might appear in the searches with a greater usage rights [4]. ;
  
  I guess you also use a box on your page that people can copy/paste on their site where you use a "by line". Although there is some discussion about the use of "by lines", it is the best practise under Creative Commons. Therefore, I would use it. Although you don't have to use nofollow (because to me it is normal to give the orginal author credit and thereby a recommendation), these days it seems like a good thing to do for your users and for yourself as in a risk management way.
  
  [1] ;https://creativecommons.org/choose/
  [2] ;http://wiki.creativecommons.org/Best_practices_for_attribution
  [3] ;http://googlewebmastercentral.blogspot.be/2009/08/specifying-images-license-using-rdfa.html
  [4] ;https://support.google.com/websearch/answer/29508?hl=en
• 
  Marilyn Lesniak: Thanks so much for clarifying Edwin! I will look into that
• 
  E.Dieter Martin: Copyright for recipes is difficult. You can't copyright the actual recipe, but you can copyright the images and the story around the actual recipe. See  ;http://foodblogalliance.com/a/recipe-attribution/ for a few more details.
  
  As +Edwin Jonk ;says, links to recipes that inspired you or you are refining should have the follow flag, just as other blogs linking to your recipe should use follow. Those are natural links and there's a clear purpose for the link.
  
  Blogroll links should be nofollow or follow only once throughout the entire site, preferably on the front page.
• 
  Marilyn Lesniak: Thx. Still wrapping my head around all the seo info, but with good commens like your I am slowly retaining it!