Centrality analysis can get much more sophisticated than PageRank (which is why Google uses PageRank only as a part of their overall search relevancy computatio

Centrality analysis can get much more sophisticated than PageRank (which is why Google uses PageRank only as a part of their overall search relevancy computation). But even exposing something as trivial as a PageRank for twitter is extraordinarily valuable for a number of use cases, especially since, AFAIK, no one has done it before.