Since there is no race this weekend, I was bored and did some online searching. I found a real "Like" button addon and installed it.
Here is a brief overview:
The new button is just to the right of the "Quote" button:
When you "Like" a post this information will be added below the post:
Information is also added below the avatar - "Has liked" and "Been liked"
If you change your mind, you can click the button again and remove your "Like":
When you view your own Profile, there is a "Likes List" added to the bottom: