Thanks to the expert help of Michael Bauer (akerbeltz), Indigenous Tweets now supports 54 languages! Michael combined his broad knowledge of indigenous and minority languages with many hours of searching on Twitter (even burning through his daily quota of searches on the web site), and was able to find users tweeting in the following languages: Kalaallisut/Greenlandic, Tahitian, Bislama, Sardinian, Corsican, Aymara, ᏣᎳᎩ/Cherokee, Kabyle, Rumantsch, Tongan, Eʋegbe/Ewe, Míkmaq/Micmac, Walon, Asturian, and Yucatán Maya. I used his suggestions as starting points for the crawler and have turned up additional users in many cases.
I welcome contributions of this kind in the comments. Just give the language name (in English and in the language itself if you know it), the ISO 639-3 code, and a list of Twitter usernames and I will add them to the site.
Go raibh míle maith agat a Mhíchíl!