1. Better information for the community and someone looking out for their interests to highlight the best.
2. Better journalism because the links to other sources can be put in context and explanations added.
3. More potential traffic and time on site for the news organization, which delivers more value to advertisers or sponsors. (More time on site would derive from having more links to engage readers, not from any assumption that the main site would publish more than teasers.
4. More exposure for smaller sites and other sources of information, who can potentially be part of a network that delivers more value to advertisers and users alike.