alt Hacker NewsMessenger seems to be properly multi-device, but you pay for this by some PIN code bullshit (maybe they removed that, I haven't seen a popup about this for over a year now?) and having to sync chat history in the background, through a process that is, of course, broken and unreliable.
I'm actually still jaded about this. Messenger worked fine before they broke it by introducing E2EE; it took years for them to fix the problems this caused (at least the ones that were immediately user-perceptible).
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It's still broken if you're like me and you clear cookies
"Let's take people's years-long history between each other and just utterly break it. Why? 'privacy'" but they've never cared about it, they're opportunistic fucks. It's Zuckerberg's company to do with it "as he wishes" https://news.ycombinator.com/item?id=16770818
yeah messenger still has the pin code thingy, i'm curious why they do it at all that way, can't you just have your keys on fb servers encrypted with another set of keys derived from your password, which is much stronger than a 4-6 digit key?