How many of you have used Digg and Stumbelupon ?

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Digg is a popular site that can be used to check out all the interesting news and evenent going around world. Similarly, stumbleupon can be used to find the types of sitesd that you would like to surf. In stumbleupon, sites are suggested to you as per your feedback to it. Apasrt from entertainment and pass time, these two sites are also popular amoung webmasters, and is often used to draw traffic to their own websites. I was just wondering, how many of you have used Digg and stumbleupon, and how often do you use it ? I tried both, but didnt liked either of them much :P