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Thanks for adding this information! I had wondered why people I hardly knew were sharing something "directly" with me.

Clearly the most important factor in social bookmarking success is the number of upvotes or shares/re-posts of a link. The more active networks will obviously do better: I only intend to ask if there is one that seems to have a lot of value that isn't making headlines...

Hey Brian, If the EDU advice in the SEOMOZ Professional Guide to Link building is correct, (it discusses the EDU myth and if it holds more value than that of a normal link/URL) then i'd imagine that a ccTLD would be a more beneficial link for localised results/sites than one from a non ccTLD, just like any other domain would be. You'd still get the EDU kudos but with the additional benefit of it being more targeted to a region. eg: a link from an edu.ph would be more beneficial for a Philippino site, than a straight .edu would.