Discussion: Should I add rel="nofollow" to links that are included with my widget?

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

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  Micah Fisher-Kirshner: Wasn't there a hangout where someone at Google suggested the TripAdvisor links were okay due to relevancy or am I just imagining that this morning?
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  Jim Munro: You are right, Micah. The saga began during DSQ HOA #8 followed up by a question Richard posed to John.
  
  I think it was Richard, anyway, it may have been Rob Maas.
  
  We'll see. :)
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  Micah Fisher-Kirshner: Ah, it was with +Rob Maas, I believe. Would be interesting to get an updated response from +John Mueller then (even if it's a no-update update).
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  Rob Maas: I wasn't in the hangout to respond but he kinda answered it again:Webmaster Central Office-Hours 2013-08-26
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  Micah Fisher-Kirshner: +Rob Maas: Do you have the exact time where it was addressed?
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  Rob Maas: 40 minutes (wasn't that in the link ?)
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  Rob Maas: And that was an follow up on this one: Webmaster Central 2013-08-16
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  Micah Fisher-Kirshner: Ah... seems like opening a new tab doesn't always work in getting to the right point...
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  Jim Munro: You are using the developer version of Chrome, right? :)
  
  It's a bug I think.
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  Micah Fisher-Kirshner: heck no, I use FF. I love my plugins :)
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  W.E. Jonk: Besides the Tripadvisor (which is somewhat of an anomaly because they demand dofollow links) Google itself is setting dofollow as default on their own "widgets". We all know the power of default. For example take a look at the google+ buttons.
  
  And there are many more (lets call them) "industry leaders" that set dofollow as a default. So why should a small widget maker use nofollow while all the big players are using dofollow? Isn't it good practice to look at industry leaders and learn from them? ;
  
  I don't know what G is doing but I wouldn't be surprised if they start penalizing. If my memory suits me well they did made a rather big buzz by penalizing large brands for paid links when G demanded nofollow's (BMW is crossing my mind). ;
  
  Just thinking out loud and G did this before and rather successfully. So I don't know, I just want to know if they are going to enforce this "new" nofollow rule (it is not really new because Matt discussed this before as he clearly stated in this video [*)
  
  [*] https://plus.google.com/103707711719795571011/posts/Sqwzojc3h4X ;