If you want to announce your disapproval or approval of a certain post, there’s this great mechanism built right in to do so. There are a couple of little arrow buttons; just click the down arrow on anything that you don’t enjoy.
Personally I find it dead easy just to not click on any posts that don’t pique my interest, and it’s not like this community has so much content that “high quality” posts are getting buried under the sheer volume.
If you want to start a new community which is just Linux news aggregation, you go right ahead though.