Users who want to help by editing/improving the post might be interested to know which old posts has been recently edited. MO folk does not like too much bumping, but it seems that people are more tolerant to edits if the post have been recently bumped. This was discussed a bit more here: chat.stackexchange.com/rooms/10243/conversation/…

(OTOH if the post has been bumped by a new answer and there is something worth editing, I tend to wait a bit, so that others see that the last activity was the new answer.)

I just want to remind that it is possible to see which old post has been recently active. For example, you can search for date ranges, like created:2009-01-01..2017-01-01 or created:2009-01-01..2017-06-01.

If you want to see questions from your favorite tags, where you are more likely to find something interesting or add something of a reasonable value, you can add intags:mine. As in created:2009-01-01..2017-01-01+intags:mine or created:2009-01-01..2017-06-01+intags:mine.

Similarly, if you want to help with removal of deprecated tags, you can see which posts in those tags are new or recently bumped. So you can search for recently active questions with the tags abstract-algebra, discrete-mathematics, geometry or topology.

As mentioned before, this might be useful also for users who only want to see only post with new answers and new questions.

And there are also other possibilities:

I guess that travelling-salesman-problem would probably be a more clear tag-name than the recently created tsp. (But maybe that's just me and everybody understands it from the shortcut.)

It seems that the tag was created in this suggested edit.