Adding Google Reader (or My Yahoo or Bloglines) will result in your Google Reader appearing in Viigo. However, there could be time delay before the articles from your feeds actually appear.
The reverse doesn’t happen. Your Viigo feeds will not appear in your aggregator. Also, any articles that you have read or deleted in your aggregator will not appear in Viigo.
Finally, Viigo takes the feed name from the publisher. This means that if you changed the feed name in an aggregrator, that name change doesn’t appear in Viigo. Also, because the feeds come from an aggregator, you won't be able to customize their titles from inside Viigo.
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