I noticed something a bit odd when liking a notebook:
“fork” and “collection” are clickable and do what you would expect.
The “heart” icon however is not clickable and you have to look way over to the right to find another “heart” which has your “liked” state.
Why not make the little grey heart clickable and show your “liked” state as well as the big button one?
If you have liked that page, the grey outlined heart is now filled in and red.
Or if not that, make the “likes” clickable and display a list of users who liked the notebook?