I recently got an email notification from Facebook for a like on my recent wall post. And this is the first time I am getting any such notification. This must be a new feature introduced recently. Although it will help you get the email notification for like on your wall posts earlier it was only for comments. But it will also flood your email inbox with notifications. As generally on a wall post, likes are more as compared to comments.
There’s no update regarding this on Facebook official blog, may be because this update is too minor to get space on the official Facebook blog. However there’s a new addition to the notification tab of the settings page to enable or disable the wall post likes notification. If you get too many notification emails because of this new update you can disable it following the below steps:
Goto Account -> Settings -> Notifications -> Uncheck the box against ‘Likes your post‘.