This is an interesting study I came today. The languages I Know is English and Afrikaans. However in South Africa we have 11 languages officially including Afrikaans, English, isiNdebele, Pedi, Sesotho (Sotho), siSwati (Swazi), Xitsonga (Tsonga), Tswana, Tshivenda (Venda), isiXhosa, isiZulu

Perhaps this is also a good means of good communication worldwide. There are a total of 6909 languages according to Nations online
Source: http://www.nationsonline.org/oneworld/languages.htm

Some studies of language importance

  • English : official language in 83 countries/regions (ISO), spoken in 105 other countries (E).Curiosity: English language does not have official status in Australia, the United Kingdom, and the United States.
  • French : Official language in 40 countries (ISO), spoken in 54 countries
  • German : spoken in 40 other countries
  • Arabic : Official language in 26 countries (ISO),
  • Russian : official (or co-official) language in 4 countries (ISO), spoken in 31 countries (E).
  • Spanish : it is official language in 21 countries (ISO), spoken in 44 countries (E)
  • Portuguese: official language in 9 countries (ISO), spoken in 34 countries
  • Hindi: India
  • Urdu: India, Pakistan

Source: http://www.nationsonline.org/oneworld/most_spoken_languages.htm

Though in India, Hindi is the official language, most citizens speak their regional languages in their respective states. Ironically Tamil is favored also outside India. Tamil (Spoken):

Other Sources:

Happy Reading !