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by kuschku 3310 days ago
Actually, reddit has that. You can save threads or comments, and sort by latest.
1 comments

And with reddit gold you can even have it hilight all new replies regardless of sort order. This can be really useful for viewing older discussions and see what's been added.
The RES browser extension does this without needing gold, or am I wrong about that?
It does not – with reddit gold, it highlights also all replies in the thread itself.