[Mordisquitos]

I imagine that they have two motivations in mind:

1. Get more useful data from users like myself who have a Twitter account but are not logged in by default. Every time I click on a tweet that a friend sent me by IM or that I saw linked elsewhere, they are not getting that juicy detailed data regarding my user having seen this tweet.

2. Just assume that mainstream users will simply go "Oh well, I'll make an account" and think nothing of it.

[queuebert]

They still have cookies and your browser fingerprint. You might be surprised how complete their picture already is.

[Mordisquitos]

They would if I meant "not logged in by default" on the same browser, but I mean on completely separate devices which have never even touched my Twitter account—not out of paranoid sandboxing on my part, mind you, just no motivation to log in. I barely tweet anything at all, so why bother login in.

Could they still know it's my "user" who is seeing this or that tweet, by using intelligence-agency level analysis on usage, personal connections, and networking patterns to determine that it's me? I'm sure they could. But why bother to such a massive level of complexity when they could simply require login to view tweets instead?

[SV_BubbleTime]

Have you been introduced you to Firefox containers? Best feature the masses will never use.