The best alternatives to Marklog are dewey., Tweetflick, and TweepsBook. If these 3 options don't work for you, we've listed a few more alternatives below.
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With dewey. you can grab all of your existing Twitter Bookmarks, search, sort, tag, create and share collections, and yes even export your Twitter Bookmarks to your favorite note-taking app.
Introducing TweepsBook, an enhanced bookmarking tool for power Twitter users that helps you streamline the clutter by adding different tags and organize tweets based on your liking. With TweepsBook, your time is well spent learning.
https://mybookmarks.space is a twitter bot that allows you categorize your tweets as bookmarks, so you can easily find them when you are ready to read them. How? It's simple, Mention the bot using "@mybookmarkspace bookmark categoryName"