1. A content management and distribution system, comprising: a computer system comprising one or more computing devices; a network interface; and a computer storage system comprising a non-transitory storage device, said computer storage system having stored thereon executable program instructions that direct the computer system to at least: maintain a data store comprising: profiles of a plurality of content contributors, including an identification of professions associated with at least a portion of the content contributors, wherein the identified professions for the portion of the content contributors include at least one of the following: athlete, actor, agent, athlete scout, medical expert, or celebrity, and access indicators for the content contributors indicating which content requesters may submit content requests to a given content contributor; provide an interface configured to receive a request to be provided to a given content contributor for video and audio content of the given content contributor; identify a first requester accessing the content management and distribution system; based at least on the identity of the first requester, locate in the data store content contributors that the first requester is permitted access to; provide a search user interface enabling the first requester to search for content contributors; receive a search query from the first requester via the search user interface; identify, using a search engine, matching content contributors in response to the search query; provide a listing of the matching content contributors, wherein the listing of the matching content contributors is restricted to those content contributors to whom the first requester is permitted access to; receive a request for new content from the first requester, the content request comprising: a selection of a set of content contributors from a user interface that lists, using assigned set identifiers, a plurality of content contributor sets defined by the content requester and/or one or more specifically identified content contributors; a content subject matter specification provided via the content subject matter interface, including a request for video and audio content of a content contributor discussing a first specified subject; and response deadline timing information; transmit, using the network interface, at least a portion of the content request, including the content subject matter specification and deadline timing information, to respective applications installed on mobile communication devices of the selected set of content contributors and/or of the one or more specifically identified content contributors, wherein the respective applications are configured to display the request, and at least partly in response to a given contributor providing a first input, prompt the given contributor to capture the requested video and audio content; receive an indication from one or more of the mobile communication devices of the selected set of content contributors and/or of the one or more specifically identified content contributors, that video and audio content is being provided to a cloud-based non-transitory storage system, wherein the video and audio content is provided to the cloud-based non-transitory storage system via an application programming interface (API); provide, over a network, the first requester with access to items of content captured by a respective mobile communication device from a camera from one or more content contributors in the selected set of content contributors; and provide a control enabling the first requester to selectively download or to selectively stream one or more of the items of content from the cloud-based non-transitory storage system to a system associated with the first requester; enable a second content contributor, responding to the request for new content, to stream from the cloud-based non-transitory storage system a first item of content captured by a mobile communication device of a first content contributor responding to the request for new content, and to record a comment comprising audio and video on at least the streamed first item of content captured by the mobile communication device of the first content contributor; link the recorded comment from the second content contributor with the first item of content from the first content contributor, for which the recorded comment is being provided; display a visual indication of a parent-child relationship with respect to the recorded comment from the second content contributor and the first item of content from the first content contributor, for which the recorded comment is being provided.