By no means a definitive list, I have broken it into curated, where you submit and may get put up, and open sites, you join and post the link to. Would like to hear if anyone has any more sites for this list.

Open Sites, where you can place work mostly through joining and having a page.

creativereview.com (the Feed section)

liveleak.com

b3ta.com

Wonderhowto.com

Flickya.com

Indyarocks.com

myvidster.com

videosift.com

righthisminute.com

trendhunter.com

boredpanda.org

funsubstance.com

coub.com

Curated Sites: these are sites to send links for consideration.

Openculture.com

Meme-meme.org

devour.com

culturalweekly.com

digg.com

flixxy.com/

onedot.com

bitsandpieces.us

brainpickings.org

Fark.com

gawker.con

nowness.com

laughingsquid.com

thekidsshouldseethis.com

knowyourmeme.com

inquisitir.com

neatorama.com

walltowatch.com

boingboing.org

walltowatch

incrediblethings.com

upworthy.com

vultured.com

viralselect.com

Thedailywhat

fubiz.net

venturebeat.com

petapixel.com