Tried searching up "Elm (programming language)" and it brought up 3 companies near me. None of which actually used Elm. One of them was just some fashion company named "West Elm". I don't think the data is 100% accurate, but still a useful tool nonetheless
Looked up "javascript" and it found a total of like 4 results in my entire country. I think this thing needs some time to get meaningful data before it becomes useful. It's like a search engine without anything indexed yet.
Interesting, JavaScript should result in relatively many good results. In which country did you search? Even in my old hometown with a population of ~25k I find seven companies. Currently, Asian countries and esp. China have few companies - mainly due to the language barrier.
Companies and countries with "technologies in their name" such as Jasper (city) or Java (Island) will currently cause false positives as we are only using regexes to identify the technologies. However, the words are used by these companies in their job ads or descriptions.
I see a lot of Clojure results, but when I go into the actual page, I had to go to seven or eight different pages to actually see Clojure mentioned. I'm not sure where the data actually comes from.