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None in constitution or legislation though Portuguese and the local creole (Portuguese-based) are used in government (Portuguese for written communication) (Aménagement). Wikipedia, however, indicates that Portuguese and 3 forms of Portuguese creole are official.
No legislated status. Creoles, especially the Sao Tomean variety, are spoken and there is apparently a community of Fang speakers (according to L'aménagement linguistique dans le monde but not Ethnologue).
Ethnologue's list of 4 languages is at http://www.ethnologue.com/show_country.asp?name=ST
None. (Fang is listed under Beti)
The site L'aménagement linguistique dans le monde has a page on http://www.tlfq.ulaval.ca/axl/afrique/Sao-Tome-Principe.htm (see section 4)
Institut national de 1'éducation et de la culture - SAO TOME
(Source: UNESCO, 1985)
UNDP (2006) gives a literacy figure (without reference to which language[s]) of: 83.1%
Latin alphabet is used.
The APC page, "ICT Policy in Sao Tome and Principe" has some information and links: http://rights.apc.org/africa/test.shtml?apc=s21856e_1
APC, "ICT Policy in Sao Tome and Principe," Africa ICT Policy Monitor, http://rights.apc.org/africa/test.shtml?apc=s21856e_1
International Telecommunications Union (ITU). 2006. World Information Society Report 2006. Geneva: ITU. http://www.itu.int/osg/spu/publications/worldinformationsociety/2006/wisr-web.pdf
______. 2004. African Telecommunication Indicators 2004. Geneva: ITU.
Internet World Stats: Africa. 2006. http://internetworldstats.com/africa.htm
Leclerc, Jacques. L'aménagement linguistique dans le monde, "São Tomé e Príncipe," http://www.tlfq.ulaval.ca/axl/afrique/Sao-Tome-Principe.htm
SIL International, Ethnologue: Languages of the World, "Languages of São Tomé e Príncipe," http://www.ethnologue.com/show_country.asp?name=ST
UNDP. 2006. ''Beyond scarcity: Power, poverty and the global water crisis. Human Development Report 2006.'' New York: United Nations Development Programme (UNDP). [Human development index Adult literacy rate (% ages 15 and older) (HDI) http://hdr.undp.org/hdr2006/statistics/indicators/3.html ]
Vodafone. 2005. "Africa: The Impact of Mobile Phones." The Vodafone Policy Paper Series, Number 3, March 2005. http://www.vodafone.com/assets/files/en/GPP%20SIM%20paper.pdf
''Wikipedia, "São Tomé and Príncipe," http://en.wikipedia.org/wiki/São_Tomé_and_Príncipe
______, "São Tomé e Príncipe," http://pt.wikipedia.org/wiki/São_Tomé_e_Príncipe