Feature

During the design phase, the product manager and the developers categorize the requirements as

• Must have
• Nice to have

During extensive testing and often much later, bugs (of varying severity) show up. Some subtle errors are dubbed features.

Facebook has a couple of features.

In group photos with Yours Truly, FB would tag me as my brother. The error might be due to the

• facial recognition system (which is not yet perfect)
• unintentional tagging (by some user hitting the wrong key when asked to tag)
• the guestimate (“guess estimate”) algorithm to “match” faces and names (in the post)
  
  I would often get friend requests from some questionable FB users.
  There are several who belong to 50+ (or 100+) groups. I am not sure whether they are humans with lots of free time, or robots.
  The meaning of a friend (e.g. A friend in need is a friend indeed) has been “downgraded”.
  Some have no photos and bare info on their timeline.

The “View As” feature contributed to an opportunity for data miners, hackers and cracker