Facebook users have noticed their hidden "other" messages en masse and many of them are not happy.

Under the Facebook Messages tab there is an "other" tab, which you very well may have never noticed. It hosts the messages Facebook has deemed less important, often meaning messages sent by events or users with whom you have no apparent connection.

Though the feature is not new, it has recently caught the attention of many, including a Slate reporter who was messaged by a man who found her lost laptop.

Below you will notice where your "other" messages live on Facebook. My inbox has messages from events going back several years. Based on when my unread messages begin, I would guess Facebook introduced the feature in either late May or early June.

We gathered reactions from Mashable commenters and Twitter.

Facebook Users Reactions to Hidden Messages

Now we'd like to know how you reacted. Were you upset to find any hidden messages? Did something important go unnoticed?