1. A method, comprising: identifying, by one or more servers, a user connected to a network; for each of a plurality of items, determining a probability that the user will post or repost the one of the plurality of items; for each of the plurality of items, determining, by the one or more servers, for each of one or more followers of the user, a probability that the corresponding one of the followers of the user will repost the one of the plurality of items if the user were to post the one of the plurality of the plurality of items, wherein determining for each of one or more followers of the user, a probability that the corresponding one of the followers of the user will repost the one of the plurality of items is based, at least in part, on a probability of influence of the user on the one of the plurality of followers and a likelihood that the one of the followers of the user will be interested in the one of the plurality of items; for each of the plurality of items, for each of the one or more followers of the user, determining for each of a set of followers of the follower of the user, a probability that the corresponding one of the set of followers of the follower of the user will repost the one of the plurality of items if the follower of the user were to post the one of the plurality of the plurality of items, wherein determining for each of the set of followers of the follower of the user, a probability that the corresponding one of the set of followers of the follower of the user will repost the one of the plurality of items is based, at least in part, on a probability of influence of the follower of the user on the one of the set of followers and a likelihood that the one of the set of followers of the follower of the user will be interested in the one of the plurality of items; selecting, by the one or more servers, a number of the plurality of items based, at least in part, on (1) the probability, for each of the plurality of items, that the user will post or repost the one of the plurality of items, (2) the probability that has been determined, for each of the plurality of items, for each of the one or more followers of the user, that the corresponding one of the followers of the user will repost the one of the plurality of items if the user were to post the one of the plurality of items, wherein the user has not posted the one of the plurality of items, and (3) the probability that has been determined, for each of the plurality of items, for each of the one or more followers of the user, for each of the set of followers of the follower of the user, that the corresponding one of the set of followers of the follower of the user will repost the one of the plurality of items if the follower of the user were to post the one of the plurality of items; and providing the selected number of the plurality of items for presentation to the user; wherein each of the plurality of items is an Internet meme.