Trackur is designed for reputation management. It searches for mentions across the social web, and indicates the influence of people making the comments.
Netvibes is suited for social media enthusiasts whom want to convert visits and click to sales. Bu utilizing the dashboard, you are armed with the capabilities to produce a higher amount of traffic to any website.
While both (Netvibes and Paper.li) are content aggregators, they perform very different functions. Netvibes is extremely useful when you are trying to catch up on the news on the go, come up with more content ideas based on the current trends and use the trending articles in your content marketing.