semanticpool

The Gnip API provides notification of activities (events) occurring in a variety of services and, whenever possible, a guid that identifies the activity itself vis a vis the service it was created on. Activity examples include a user “tweet” (twitter), a user “dugg” (digg), a user creating a blog post, etc.

(see gnipcentral.com, Gnip API)

You can leave your polling tasks to Gnip and only consume the data over their API.