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No, they're not in any of my exports, etc.
What they means is that they use a key:value store and only mark the tweet as deleted rather than actually delete it.
This makes sense because:
- Legal issues (don't actually delete tweets involved in ongoing cases, but they have no way to know which tweets those are)
- Performance (deletion is expensive and fragmentation of storage is messy, best just flip a bit)
I don't assume that my tweets were never public or no longer exist... I assume that if I can't see them now then those looking will also not see them now without extraordinary resources and access.
I don't tweet things that I'm uncomfortable with saying publicly, but delete because the definition of comfort changes with time.
- Legal issues (don't actually delete tweets involved in ongoing cases, but they have no way to know which tweets those are)
Yeah, that will happen.
I don't have Facebook and I am both careful with what I put on Twitter as well as using https://www.tweetdelete.net/ to purge tweets older than a given point in time (2 weeks, as that is the longest I've seen an active conversation last there).
Border staff typically do not use advanced tooling, they have their core database and then they have Google. So deleting publicly visible is a good thing to do.
Harder is what to do if asked for passwords to social media accounts. On that front it's also better just not to have the account in the first place.
Going back to travelling in general, one of the security guys where I work flies by these rules:
He flies with crap phones, set up with minimal info, with VPN (internet kill switch enabled) and wipes the device of local data before he flies. It's an interesting combination as he'll turn a phone on if asked, but there won't be any data on it and it won't connect to anything without that VPN running.
He's gone for the minimum level of compliance, with a little inconvenience for himself. He's not on social media sites.
Also interesting... define social media. I think the only reason forums are not counted is because of the lack of a key feature... connections between people.