1. A method for using an interest graph, the method comprising: obtaining, by a processing device, a plurality of interests, the plurality of interests being associated with a plurality of users, and the plurality of interests being associated with a plurality of topics; generating, by the processing device and based on the obtained plurality of interests, the interest graph, the interest graph including: a plurality of nodes, each of the plurality of nodes representing a respective interest of the obtained plurality of interests; and at least one link, the at least one link linking a first node, of the plurality of nodes, to a second node, of the plurality of nodes, and the at least one link representing a measure of relatedness of the respective interest represented by the first node to the respective interest represented by the second node; receiving, by the processing device, one or more user interests associated with a particular user; determining, by the processing device and using the interest graph, that the one or more received user interests do not match any of the obtained plurality of interests; determining, by the processing device and based on determining that the one or more received user interests do not match any of the obtained plurality of interests, a measure of similarity between the one or more received user interests and at least one of the obtained plurality of interests; associating, by the processing device and when the measure of similarity between the one or more received user interests and the at least one of the obtained plurality of interests satisfies a threshold value, at least one of the one or more received user interests with the at least one of the obtained plurality of interests; and providing, by the processing device and based on associating the at least one of the one or more received user interests with the at least one of the obtained plurality of interests, information associated with the at least one of the obtained plurality of interests to the particular user.