14. A system comprising: at least one processor; and a memory, including code that executes as a crawling mechanism and as a backfill mechanism, the memory coupled to the at least one processor such that the at least one processor executes the code, the crawling mechanism that searches for newly added content at one or more data sources and determines whether the newly added content has been previously presented at an interest group feed, and on condition that the newly added content has not been previously presented at the interest group feed, the backfill mechanism: retrieves the newly added content associated with the one or more data sources, processes the retrieved content to select at least some of the content and associates the selected content with a permissioning scheme that controls access to the selected content, the permissioning scheme including one or more hierarchical permission levels; backfills the interest group feed with at least some of the selected content based on a permission level of the permissioning scheme that corresponds to the permission level associated with the interest group feed; receives example content associated with a topic that does not correspond to an existing interest group feed; applies an entity extraction mechanism to identify seed entities related to the example content; generates a new interest group feed for the topic using the identified seed entities; and backfills the new interest group feed with content identified based upon the identified seed entities.
14. A system comprising: at least one processor; and a memory, including code that executes as a crawling mechanism and as a backfill mechanism, the memory coupled to the at least one processor such that the at least one processor executes the code, the crawling mechanism that searches for newly added content at one or more data sources and determines whether the newly added content has been previously presented at an interest group feed, and on condition that the newly added content has not been previously presented at the interest group feed, the backfill mechanism: retrieves the newly added content associated with the one or more data sources, processes the retrieved content to select at least some of the content and associates the selected content with a permissioning scheme that controls access to the selected content, the permissioning scheme including one or more hierarchical permission levels; backfills the interest group feed with at least some of the selected content based on a permission level of the permissioning scheme that corresponds to the permission level associated with the interest group feed; receives example content associated with a topic that does not correspond to an existing interest group feed; applies an entity extraction mechanism to identify seed entities related to the example content; generates a new interest group feed for the topic using the identified seed entities; and backfills the new interest group feed with content identified based upon the identified seed entities. 17. The system of claim 14 , wherein the backfill mechanism is associated with a crawler, the backfill mechanism using the crawler to select the selected content based upon one or more crawling parameters.