Hello, what's this?
"We automatically detect new buzz by crawling 50,000 of the very best web sites, blogs, and news sources. Then our technology crunches the raw data from these sites to identify new buzz thatâ€™s just starting to spread. We developed the technology to find new things just when they start accelerating in popularity and provoking interesting conversations. Our technology is also supplemented by a network of human taste-makers and tips submitted by BuzzFeed readers. These savvy humans can spot subtle trends our robots might miss."
Aggregator + some statistical analysis + human editors.