Detail of the person who like/dislike the article
Cliff Hobbs
Problem is people may not be willing for you to collect this data. You'd also need to declare what you're collecting (I presume) and get them to agree to it.
Ultimately, if you're tracking/collecting data about them, they may be less inclined to do this.
I don't personally see the benefit of Likes/Dislikes, as without the supporting "why" data it's pointless (and even if you did have the "why", you may disagree with it enough not change the content so what's the point ;-)).