Each are basically re-distribution sites but I do not want to take the chance of duplication.
Redgage only use a description but Tumblr and Zimbio will put as much as I want on their sites as they can be used as blogsites as well.
Redgage at least brings you some extra cash for throwing up your links - and you can rewrite your link description in a different way so it's not duplicate.
But overall, most social networking sites are fairly worthless for generating traffic. Pinterest is the one exception I've found so far, if used correctly. But most such sites generate a short term influx of traffic that quickly dies and most have nofollow backlinks.
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