I'm all for the idea of bumping older posts. However, imho, there should be a limit to how often a post can be bumped; say once a month, at the most.
A couple of ideas, off the top of my head, on how to do it:
Featuring them in a sidebar section, rather than the main feed.
Giving them a temporary tag, indicating they are a bumped post, that goes away after a week or so. This is similar, if not identical to, the 'featured' tag on Meta.SE.
I'm all for the idea of bumping older posts. However, imho, there should be a limit to how often a post can be bumped; say once a month, at the most.
A couple of ideas, off the top of my head, on how to do it:
I feel like the sidebar section would defeat the purpose: it makes the most sense to me in the Feed — going to Latest wouldn't show bumped posts.
I like the idea of a tag, though, so people know it was bumped.