1. A method of enabling users to share and locate content clippings, the method comprising: receiving, via an electronic communication network, a plurality of content portions and corresponding bibliography citations from clipping modules that run on user computing devices of a plurality of users, the content portions including metadata tags that describe the content portions, said metadata tags including user-generated metadata tags entered by users using a user interface of the clipping modules; storing the received content portions and bibliography citations in data storage; receiving a search request from a user computing device of a first user, via the communication network; responding to the search request by searching the metadata tags of the content portions stored in the data storage, to find at least one content portion having at least one metadata tag related to the search request; and sending the at least one content portion to the user computing device of the first user, along with at least one bibliography citation corresponding to the at least one content portion; whereby the method enables users to conduct searches for content portions uploaded to the data storage from computing devices of other users; wherein the method is performed by one or more computing devices of a network-accessible system.