Last year one of my friends shared an article. I liked it. Now there are tons of updates in between. How do I find that article again?
You'll need to go to your own All Activity page and select
Likes from the dropdown that says "All". This will show you the list of things (statuses, pages, photos, etc) that you have liked broken down by month.
Check out http://www.likejournal.com
You can try using FQL to query for posts shared by your friend that you have liked
Since May Bing is supposed to
make it easier to see what your Facebook friends “like” ...
provided that you are logged in to your facebook account. However, the search results depend on many factors so your likes are not guaranteed to appear at the top of the list.
Click your name on the header, next to search field.
Click "Activity log" on your cover photo.
Click "Likes" in the left sidebar.