Okay, this is what happens. After I clicked "Like", it put a button to comment.
Here's a screenshot from my FB "wall".
I don't see any like buttons, MrsLMB, either.
I don't think it's a big deal. You don't have to click it. If you click it by mistake, you can click cancel in the window that pops up. Bottom line: If you don't like it, don't use it. I think it's a cool way to share a post from here with my FB friends and it puts a link to DC on FB. Heck, I already "like" DC on FB.