In an attempt to shorten the length of a form or reduce visual noise, designers use placeholder text as an input label. This practice places burden on short-term memory. The label disappears as soon as the user clicks and/or types. The entry must be deleted to expose the label again.
Allow users to only see notifications from people that are following them. Yes. That’s right. Not people that they are following, but people that are following them. If you’ve ever been the subject of a dogpile, you’ll understand why this is useful.