Hello from Betsy, new ISP fellow and blogger.
Perhaps this is old news, but I found this fascinating. A new Boston University study shows that the people with the largest social networks are not necessarily the best idea spreaders. Instead, the best ideas spreaders are those at strategically placed nodes, even if they are less well connected: http://www.technologyreview.com/blog/arxiv/24748/?ref=rss&a=f.
This seems to suggest that people at nodes accessing diverse networks may be better equipped to spread information than those well connected within a single network. Does this redefine the ‘key players’ for information-sharing, or how best to target advertising? Does it suggest yet another reason to value diversity in networks? Food for thought.