What is the smallest spoken language in the world?

Most Native American languages dying out.
http://wiki.answers.com/Q/What_languages_are_least_spoken

Bikya - Though possibly extinct no

Also Latin - some people are fluent

https://www.quora.com/How-many-people-in-the-world-can-speak-Latin-fluently

It's actually debatable as to when a language is dead. Some argue that when no speakers are left, it is dead. Others argue that when only one person is left who can speak it, then it is dead because who is he/she going to speak it to? Usually, the least spoken languages are the least studied ones. Why? Because they are in obscure or inaccessible places, or because they are overshadowed by very dominant official languages and thus hard to ennumerate. There are probably still-undiscovered or unrecorded languages in South America and Papua New Guinea. This is a very difficult question to answer.....

I agree, you can't answer this.

That being said, this Wiki list is interesting.
It lists Ter Sami as the smallest spoken language today, with 10 speakers.

https://en.wikipedia.org/wiki/List_of_languages_by_number_of_native_speakers#Fewer_than_1.2C000

Another Wiki list claims that the Bung language of Cameroon has only 3 speakers.

https://en.wikipedia.org/wiki/List_of_endangered_languages

Curonian language had 7 speakers in 2002, according to this German Wiki page.

http://de.wikipedia.org/wiki/Nehrungskurisch

Some other contenders include Ratagnon (2-5 speakers), Pemono (one speaker, may be extinct by now), Mapoyo (2 speakers) and Siletz Dee-ni (one speaker). However, there are many languages with equal or comparable amounts of speakers. I suggest you look at the last link for more information.

https://en.wikipedia.org/wiki/Ratagnon
https://en.wikipedia.org/wiki/P%C3%A9mono_language
https://en.wikipedia.org/wiki/Mapoyo_language
https://en.wikipedia.org/wiki/Siletz_Dee-ni
https://en.wikipedia.org/wiki/List_of_endangered_languages

I'm interpreting "smallest spoken language" differently.

The 1971 Guinness Book of World Records reports that the language with the smallest vocabulary is Taki taki, a South American language that uses only 340 words.
http://books.google.com/books?id=0AL5jE_Q5wQC&pg=PA277&lpg=PA277&dq=language+%22smallest+vocabulary%22+taki+taki&source=web&ots=QA2IWdC5ZP&sig=4RcttVR5dahe6-CY7NvYDHKq_Og&hl=en

The language with the smallest vocabulary in the world is a Creole called Taki-Taki (about 750 words) spoken in Suriname, South America. It is a curious mixture of West African, English, French, Spanish, Portuguese and Carib Indian elements with the English words predominanting.
https://en.wikipedia.org/wiki/Sranan_Tongo