Branded content and native ads are nothing new, but Upworthy’s announcement of sponsored curation presents an interesting opportunity for cause marketing and social responsibility initiatives. The viral content network is planning Upworthy Collaborations which let brands deliver promoted posts, sponsored content curation around key themes and content consultation. Their first collaboration has been Unilever’s Project Sunlight which has curated a section of articles around sustainability efforts. There will certainly be plenty of eager brands looking for these custom opportunities but how will Upworthy revenue compare with a traditional display model?