1. A method for summarizing an electronic document, comprising: detecting via a processor, for each sentence in said document, a concept in said sentence; associating, via the processor, each detected concept with a weight, wherein said weight represents a degree of similarity between the detected concept and its corresponding reference concept in a concept library available over the internet; representing, via the processor, each sentence with a vector comprising concept-weight pairs; according to the detected concepts, computing relevance measures between the sentences, wherein the relevance measures are based on a respective vector representation of each sentence; constructing a concept-aware graph, wherein a node in said graph represents each said sentence in the document and an edge between two nodes represents the relevance measure between two sentences represented by the two nodes; utilizing the concept-aware graph to rank the sentences in the document; summarizing the document by selecting representative sentences based on the ranks; and providing, via the processor, the summarized document to a user to enable the user to make a determination if the electronic document is to be downloaded from the internet.