Fastest route on desktop: go to x.com/i/bookmarks. On the phone: tap your profile picture in the top left, then Bookmarks. Below is the full walkthrough for both, how folders work, and the thing that actually makes bookmarks hard to find once you have a lot of them.
The list opens on your most recent save and scrolls backwards from there.
On a post, tap the share icon and choose Bookmark, or tap the bookmark icon directly if your version shows one in the action row. It fills in to confirm. Tapping it again removes the save immediately, with no confirmation and no undo, which is worth knowing because an accidental tap while scrolling is a real way to lose things.
X does have folders, but they're a Premium feature. With Premium you can create named folders and file a save into one when you bookmark it, or move it later. On a free account everything goes into one flat list and stays there.
Folders help less than you'd hope. They only work if you're disciplined enough to categorize every save at the moment you make it, which is exactly the moment you're least interested in doing filing. And a folder with 200 posts in it has the same problem as a list with 200 posts in it.
The bookmarks screen has a Clear all Bookmarks option in its overflow menu. It does exactly what it says, all at once, and there's no way to get them back. If your bookmarks vanished and you weren't expecting it, that's one candidate, though usually there's a different reason.
It's finding the save. X gives you no search box for bookmarks, no filters, no sorting, and no way to jump to a date. The list is reverse-chronological and that's the entire interface. Under about fifty saves this is fine. Past a few hundred it stops working completely, because the only tool you have for locating a thread from March is scrolling to March.
Which means most people's bookmarks quietly become a write-only pile. Things go in, nothing realistically comes out, and you end up googling for a post you know you already saved.
Zihin is built for the part X leaves out. A Chrome extension syncs your X bookmarks into a library where you can actually search them, including semantic search that finds a save by meaning when you only half remember the wording. You can chat with your library and get answers cited from your own saves, everything gets auto tags and topics, and decay scoring resurfaces saves you're on the verge of forgetting instead of burying them under whatever you saved this week. LinkedIn saved posts and Chrome bookmarks come into the same library, so one search covers all of it.
The extension reads your bookmarks through your own logged-in browser session, only when you start a sync. Your X credentials never leave the browser and are never sent to a server.
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