I can see how this would be confusing if you don't use Facebook. On Facebook, it's common for people to post things that say they like something. I might mark on Facebook that I like Dickens, or that I like a certain TV show, or that I like singing in the shower. When I say that on Facebook, all my friends get a message that says, "Beth likes singing in the shower."
PBS has made it easy for me to say "Beth likes Paperback Swap," along with a link to this site. All I have to do is click that button, and assuming I'm logged in to my Facebook account, all my friends will see something that says I like Paperback Swap. (I haven't done this exact thing so I might be getting some of the details wrong, but this is the idea.) Also, later, if people are checking out my stuff on Facebook, there is (I believe) a spot where the things I like is posted, and Paperback Swap would show up there. Good advertising for PBS.
If any of my friends had already "liked" PBS, then when I saw that PBS main page, it would say, "Jane Smith and Mark Austin like this." That could be useful information for me, if I was coming to PBS for the first time and trying to figure out if I was interested in it. I could contact them and ask them for details, for example, or I judge just based on that endorsement.
I don't think that right under our personal information is quite the right place for it, because it's not clear what the "this" is that people are liking: it is Paperback Swap, not your personal information.
Hope this clarifies things!
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