1. A method comprising: by one or more computing systems, receiving an indication of a first user action by a first user; by one or more computing systems, when the indication is received: analyzing content of the first user action; determining a topic of the first user action based at least in part on the analysis; determining whether the topic is trending; determining whether the first user has indicated a preference to exclude posts associated with the topic or a category associated with the topic; and in response to a determining that the topic is trending and there is no indication of the preference, then: notifying the first user that the topic is trending; identifying a second user action by a second user that relates to the topic; determining whether the first user has indicated a preference to exclude posts associated with the second user; and in response to a determining that there is no indication of the preference, sending to the first user information associated with the second user action with a graphical user interface (GUI) element configured to enable the first user to interact with the second user action.
1. A method comprising: by one or more computing systems, receiving an indication of a first user action by a first user; by one or more computing systems, when the indication is received: analyzing content of the first user action; determining a topic of the first user action based at least in part on the analysis; determining whether the topic is trending; determining whether the first user has indicated a preference to exclude posts associated with the topic or a category associated with the topic; and in response to a determining that the topic is trending and there is no indication of the preference, then: notifying the first user that the topic is trending; identifying a second user action by a second user that relates to the topic; determining whether the first user has indicated a preference to exclude posts associated with the second user; and in response to a determining that there is no indication of the preference, sending to the first user information associated with the second user action with a graphical user interface (GUI) element configured to enable the first user to interact with the second user action. 6. The method of claim 1 , wherein the first and second users are users of a social-networking system, the social-networking system comprising a graph that comprises a plurality of nodes and edges connecting the nodes, at least one node in the graph corresponding to the first user, at least one node in the graph corresponding to the second user, at least one of the nodes corresponding to the first user and at least one of the nodes corresponding to the second user being connected to each other by an edge.