WikiApiary:FAQ

Multiproperties
WikiApiary treats the database information given by MediaWiki as a multiproperty value. This means that even though a single value is only ever given for this, WikiApiary will allow multiple values to be given over time and handle them gracefully. WikiApiary records every answer the website returns for multiproperty values, and then aggregates all answers that have been given in the last 2 weeks ordered by the first time that answer was given. This feature is most notable on large Wikifarms that have multiple database versions in production for long periods of time. On each request, WikiApiary might see a different database and update the values repeatedly causing the value to flap between multiple values. One notable side affect of this is that is that if a wiki that only uses a single database upgrades or changes the database, both the new and old value will be reported for two weeks until the old one expires.

You can read the background on this at this thread.

Demote
This flag is used to mark that a website should not be highlighted in lists of popular websites. It also serves as a flag to indicate that a website shouldn't be shared to the @WikiApiary Twitter account. It will be used generally to not highlight that site going forward. Typically this would be used for sites that are overtaken by spam, or sites that contain objectionable content. see property