|Welsh language Twitter conversations (CC-BY-SA)|
|Irish language Twitter conversations (CC-BY-SA)|
|Scottish Gaelic Twitter conversations (CC-BY-SA)|
|Scottish Gaelic, Great Britain and Ireland only (CC-BY-SA)|
It's very common for a large number of conversations to take place between two specific points. For example, there have been 5878 Welsh language tweets sent from Caerdydd that mention a user in Caernarfon, and 1519 Irish language tweets sent from An Cheathrú Rua that mention a user in Baile Átha Cliath. In such cases, I've scaled the brightness of the arcs so that these frequent paths show up more prominently on the maps.
|Breton language Twitter conversations (CC-BY-SA)|
|Cornish language Twitter conversations (CC-BY-SA)|
|Manx Gaelic Twitter conversations (CC-BY-SA)|
A word or two regarding the Manx map. Of the six Celtic languages, Manx has the smallest number of users on Twitter and probably the smallest number of speakers also. Several users have "Isle of Man", "Ellan Vannin" (or variants thereof) as their location (and no more specific location on the island). Because of this, I normalized all locations on the island to a single lat/long, and therefore (disappointingly) the map doesn't show what I expect is actually an interesting network of communication taking place on the island; instead it just shows the conversation pathways between the island and three users off the island.
Finally, a word about privacy. I haven't plotted locations at a granularity finer than a city or town except in cases where users have explicitly activated geolocation for their tweets. And even in those cases, since the maps are at a pretty large scale, it's impossible to pinpoint the exact location of any particular user. That said, not everyone will be so scrupulous with your data, and if the idea of a stranger plotting your movements on a map creeps you out (I think it should), you should deactivate geolocation on your Twitter account (under Settings, go to "Security and Privacy", and then make sure the box next to "Add location to my tweets" is unchecked). If you don't want anyone to know where you are at all, you can also remove your location from your Twitter profile (Settings → Profile → Location). And if you don't want sites like Indigenous Tweets to have access to your tweets at all, the easiest solution is to make your Tweets private (Settings → Profile, and tick the box next to "Protect my tweets").