Expanding activity channels in an online network

One or more storage media storing instructions which, when executed by one or more processors, cause:

• determining one or more search criteria associated with a first user;
• based on the one or more search criteria, performing a search of a first plurality of users that do not include the first user;
• as a result of the search, identifying a subset of the first plurality of users;
• identifying a second plurality of users that have responded to messages from users in the sub set;
• aggregating instances of a plurality of attribute values of an attribute of the second plurality of users to generate a plurality of aggregated values, each of which corresponds to a different attribute value of the plurality of attribute values;
• based on one or more aggregated values in the plurality of aggregated values, determining content, that is related to one or more attribute values that correspond to the one or more aggregated values, to present to the first user;
• causing the content to be presented to the first user.