12. One or more non-transitory computer-readable medium storing instructions that, when executed by one or more processors, cause performance of operations that comprise: identifying, by a computing system, multiple authors that have submitted posts to a messaging system, the multiple authors including at least a first author, a second author, and a third author; determining, by the computing system, a score for the first author based on a quantity of interactions, by a first group of at least some of the multiple authors, with posts that the first author has submitted to the messaging system; determining, by the computing system, a score for the second author based on a quantity of interactions, by a second group of at least some of the multiple authors, with posts that the second author has submitted to the messaging system; determining, by the computing system, a score for the third author based on the score for the first author and the score for the second author, due to the first author and the second author having requested to subscribe to a stream of posts that the third author submits to the messaging system; receiving, at the messaging system and from a computing device, a particular post that the third author submitted to the messaging system; assigning a score to the particular post based on the score for the third author; transmitting the particular post for receipt by computing devices that are associated with authors who have requested to subscribe to the stream of posts that the third author submits to the messaging system; determining that the score for the particular post satisfies a criteria for transmission to a recipient author that has not requested to subscribe to the stream of posts that the third author submits to the messaging system; and providing the particular post for display to the recipient author.
12. One or more non-transitory computer-readable medium storing instructions that, when executed by one or more processors, cause performance of operations that comprise: identifying, by a computing system, multiple authors that have submitted posts to a messaging system, the multiple authors including at least a first author, a second author, and a third author; determining, by the computing system, a score for the first author based on a quantity of interactions, by a first group of at least some of the multiple authors, with posts that the first author has submitted to the messaging system; determining, by the computing system, a score for the second author based on a quantity of interactions, by a second group of at least some of the multiple authors, with posts that the second author has submitted to the messaging system; determining, by the computing system, a score for the third author based on the score for the first author and the score for the second author, due to the first author and the second author having requested to subscribe to a stream of posts that the third author submits to the messaging system; receiving, at the messaging system and from a computing device, a particular post that the third author submitted to the messaging system; assigning a score to the particular post based on the score for the third author; transmitting the particular post for receipt by computing devices that are associated with authors who have requested to subscribe to the stream of posts that the third author submits to the messaging system; determining that the score for the particular post satisfies a criteria for transmission to a recipient author that has not requested to subscribe to the stream of posts that the third author submits to the messaging system; and providing the particular post for display to the recipient author. 13. The one or more non-transitory computer-readable medium of claim 12 , wherein: the score for the first author is further based on a quantity of authors that have requested to subscribe to a stream of posts that the first author submits to the messaging system, and the score for the second author is further based on a quantity of authors that have requested to subscribe to a stream of posts that the second author submits to the messaging system.