Excellent post by Andrew McAfee, Harvard Business School explaining how to use collaborative tools, social networking tools and blogs to develop the different types of online social connections you need.
collaborative tools (example: wikis)
for a core of strongly tied knowledge workers who are collaborating on a deliverable.
Evidence suggests that wikis let strongly-tied collaborators get their work done better, faster, and with more agility than was previous possible
social networks (example: Facebook),
increase number of weak ties (and hence access to non-redundant information and bridges to other networks)
use Google Blog Search to find the potentially valuable colleagues who our knowledge worker just hasn’t met yet?
The benefit of blogs becomes much more clear when they’re seen as tools to convert potential ties, strong or weak, into actual ones.