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I am not sure what you mean by "liking" a ticket. Are you talking about social media such as Facebook likes and Google+ "+1" or did I misunderstood you?

Comments are out of the question. I tried that three years ago, in hope that it would end up being something like php.net (users leaving valuable comments). Nope. The end result was people asking for free support about an irrelevant issue in the comments. After two weeks I killed comments and decided to never put them back.

As for social media "likes", it is an irrelevant metric for the documentation. We already know which documentation pages are popular. We also know when we need to change something based on client feedback. As for SEO value, only Google+ +1's would have an impact on SEO, namely on Google – actually, not SEO, but an indication that person X you know has +1'd this page. However this information is useless, as it doesn't necessarily mean that the page in question answers your question.

With regard to public tickets that metric could be of value and I'll see if it makes sense to add it. My biggest concern is page size. Right now the pages of this site are in the "brontosaurus" weight range, with a tendency to become "really effin' big". I am trying to figure out how to make them lighter and the social "like" buttons don't help very much with that :)

And I thank you very much for your valuable suggestion! I can see real benefits by allowing individual tickets (or even posts – using the permalink of a post) to be liked. I guess that combining that with a custom Google search on our site would really help our users, which the main objective. Kudos for your suggestion!