1. The use of an app to block or remove specific kinds of content (such as email spam or webpage ads). See also ad blocking.
2. (content control) Controlling access to items deemed to be a security threat to the user (content security control) or to which the device owner or network administrator has chosen to restrict access (censorware).
5. In social media, the control exercised by a user over what appears on their own feed or wall (for instance, hiding or deleting particular posts).