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I met an engineer from Twitter at a conference and he said he was on a team (6+ people) that worked full-time on the Lists page for the Twitter.com desktop site. So anecdotally, they have (or at least had) very specific teams.

would be cool if one of them could add lists to the mobile web site since lists are completely left out of there.

Interestingly, if you have the URL to one it works, but there is no interface to get to them.

Dunno if this is still the case, but throughout my tenure there (2010-2014), mobile web and desktop were totally separate teams with separate codebases.

The recent OS X update (major revision, in December or so?) was an app that Twitter contracted out to a third party.

That should show about how much they care about clients outside of Twitter.com.

I used to have an office below their Folsom Street place a few years ago

They had far, far, far, too many people working for them doing nonsense-led minutiae even back then.