More generally, and as hinted to by floatingatoll, the the 'X minutes ago' is also a permalink meaning after you click on it you can bookmark it in any bokmarki

More generally, and as hinted to by floatingatoll, the the 'X minutes ago' is also a permalink meaning after you click on it you can bookmark it in any bokmarking system you use. (I use pinboard.in) Also FWIE, going to the permalink for a comment also gives you access to the flag feature.