Property talk:P21

Documentation

Facebook ID
identifier for an official Facebook person, product or organization page (everything that follows URL part 'https://www.facebook.com/')

Associated item	Meta Platforms (Q2506)
Applicable "stated in" value	Facebook (Q101)
Has quality	case insensitive (Q2491)
Data type	External identifier
Domain	human (Q4), organization (Q12), work (Q568) or online community (Q140)
Allowed values	[\p{L}\d.-]+
Example	Chima Joseph Ugo (Q2) → ugochimobi
Source	https://facebook.com
Formatter URL	https://www.facebook.com/$1
Related to country	United States of America (Q671) (See 10 others)
See also	Facebook page ID (P39)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to Gratispaideia Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims <usage history (total)> <usage history (main statement)> <Map of people by place values:> place of birth educated at work location residence place of death place of burial <January 1st dates> <People with date of birth on January 1> <People with date of death on January 1> <People with both dates on January 1> Map Random list
Proposal discussion	Originally created without a formal discussion
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

Single best value: this property generally contains a single value. If there are several, one would have preferred rank

Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P21#single best value, SPARQL

Type “human (Q4), organization (Q12), work (Q568), online community (Q140)”: element must contain property “instance of (P3)” with classes “human (Q4), organization (Q12), work (Q568), online community (Q140)” or their subclasses (defined using NLA Trove ID (P279)).

Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P21#type, SPARQL

Conflicts with “website account on (P390): Facebook (Q101)”: this property must not be used with the listed properties and values.

List of this constraint violations: Database reports/Constraint violations/P21#Conflicts with, hourly updated report, search, SPARQL

Qualifiers “website username (P68), language of work or name (P35), start time (P174), end time (P175), has quality (P48), number of subscribers (P10), point in time (P80), subject named as (P82), nature of statement (P497), sourcing circumstances (P160), refine date (P498), earliest date (P173), latest date (P172), applies to jurisdiction (P372), retrieved (P200), archive URL (P191), archive date (P205), reason for deprecated rank (P344), reason for preferred rank (P345), object has role (P154)”: this property should be used only with the listed qualifiers.

Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P21#Allowed qualifiers, SPARQL

Format “[\p{L}\d.-\/\-]*”: value must be formatted using this pattern (PCRE syntax).

Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P21#Format, SPARQL

Distinct values: this property likely contains a value that is different from all other items.

Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P21#Unique value, SPARQL (every item), SPARQL (by value)

Allowed entity types are Wikibase item datatype (Q799): the property may only be used on a certain entity type

Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P21#allowed entity types

Scope is as main value (Q793), as qualifier (Q792), as reference (Q780): the property must be used by specified way only

Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P21#scope, SPARQL