Markers is a Chrome extension that adds mark as seen buttons to popular websites like YouTube, TED, Twitter, and Product Hunt. Organize your browsing experience by easily marking items as seen and visually identify them on your next visit.
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Once you install the Markers extension for Google Chrome on your desktop, a new mark as seen button will be added to the items listed below:
✓ Videos on Youtube (www.youtube.com)
✓ Videos on TED (www.ted.com)
✓ Tweets on Twitter (www.twitter.com)
✓ Products on Product Hunt (www.producthunt.com)
Every time you mark an item as seen, we'll change its visual appearance so that you can easily spot items you've already seen when you visit the sites the next round.
Your marked links are automatically synced and backed up on cloud. You have full control over your data.
As Arturs said, it does that one thing and does it right. Though making it do it right is a bit hard when you're consuming tons of content, as you have to manually mark it as read by clicking on the little dot.
A keyboard shortcut to toggle this on the current focused content, or the ability to automatically mark as read as it scrolls off the page (like many news reader / RSS / Reddit (RIP) apps do) would be much easier to make this to use.
Currently I use this as a "bookmarking" tool of sorts on Twitter by marking a bunch as read when I'm done, then I can see the batch of darkened tweets as my placed bookmark.