We have some heuristics for filtering articles based on the coherence of their content (sentence length, line length).
The idea is also that high quality sources will link to to other high quality sources. Based on the filtered articles we've indexed, we use a TrustRank algorithm to order them.
The idea is also that high quality sources will link to to other high quality sources. Based on the filtered articles we've indexed, we use a TrustRank algorithm to order them.