A whole account e.g. http://www.pinterest.com/food52/pins/
RSS feed: https://www.pinterest.com/food52/feed.rss
RSS feed: https://www.pinterest.com/food52/pizza.rss
You can now add this URL to Netvibes via Add -> Reading app.
Now that you have your Pinterest content in Netvibes you can search, monitor, share, tag and analyse it just like any other source of content.