I think when talking colloquially to a broader audience, "reddit-like" is good enough.
When talking internally, I don't know, "link aggregator" doesn't really describe what these are to me at all. I wouldn't call reddit a "link aggregator" it doesn't really fit what reddit is (many posts don't have links??).
I think the essential differentiator of reddit is the voting.
@jax @ada
I would call a "reddit-like" a "community elected feed" or a "voted forum".