In the past, I have found that the best way to get data on sites like Reddit or Digg is to first use the developer API they provide. As a rule, you have a focused interest in either a topic or a trend, and the only way to get this data is through the established public interface. You can also analyze feeds and combine them to reveal 90% of what you would like to know. If you want to deeply explore data not accessible through the API, then you should be prepared to spend a considerable amount of time creating custom wrappers around a tool such as cURL. If you have a budget, you can also call them and ask if they offer paid research data for users.
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