The "Like" functionality made its way to Facebook after FriendFeed had added the feature back in 2007, and now this simple gesture has migrated to other services, and even to Facebook's comments itself - except tonight, there is no liking on Facebook, meaning you will have to leave an actual comment on friends' threads or photos to indicate you actually did... like... the content.
Issues With Liking on Facebook
With no failwhale to show for itself, it is unclear if this bug is simply a hiccup or an issue of scale. Facebook has managed much better uptime records than other services, including Twitter, but there is no doubt unprecedented technical challenges can arise from the smallest nuances when spread across a global network.
Clearly a Sign the World Is Going to End
If you must "Like" items, you can still go to FriendFeed, or give a "like" to Google Reader items and Google Buzz. Those databases are doing just fine.