Add your X bookmarks
Notebook Clipper adds your whole X (Twitter) bookmarks list to a notebook in Gemini Notebook (formerly NotebookLM), each post as its own source or all of them as one combined source. Your bookmarks live under History on X, on the Bookmarks tab.
Add the posts
Open the side panel on your Bookmarks
On X, open History in the left menu and stay on the Bookmarks tab, then click the Notebook Clipper icon in your browser’s toolbar. The panel shows the page under Current Tab, with Posts to import set to All posts.

Select a notebook
A notebook is already selected at the top of the panel. Pick another one if you want, or click Create a notebook.

Choose how to save them
Under Save as, choose Individual posts to add each post as its own source, or Single combined source to add them all as one.

Click Add to Notebook
The button is at the bottom of the panel. You can keep browsing while the posts are added.