I've got this group on last.fm, it's called Dissonant Network and we're writing a lot of reviews. I think the name pretty much nails, what it's all about musically. Feel free to check it out:
1. Whitechapel
2. VoM
3. All Shall Perish
4. The Black Dahlia Murder
5. Chelsea Grin
6. Born Of Osiris
7. The Faceless
8. As Blood Runs Black
9. Abysmal Dawn
10. Carnifex
Although I'm slowly getting tired of deathcore and listen mostly to Opeth, death and black metal now.
Post your profiles? It's easier for everyone to know what each other likes that way, rather than having to make huge lists, which is fine, but yeah. Seemed like a good idea.
I love last.fm. I've discovered a crap load of bands from that site. As far as uploading your own stuff ..well, I'm sure it might be helpful in getting new people to hear your music. But from what I understand, bands barely get paid anything for those streaming sites.