But then you follow a few more people, and then a few more. You find more distant acquaintances and colleagues on Twitter so you follow them. You subscribe to experts in the niche areas you geek out about. Friends retweet something funny and you follow the author. Or somebody random @ replies and follows you so you do the polite thing and follow back.
Even if it were, Facebook's filtered feed is built to adapt to however many friends you make or Pages you Like. Rather than show an unfiltered feed of everything posted by everyone in your social and interest graph, it just shows you the best posts -- the ones with the most Likes and comments from the people you interact with most.
First, making it quicker to unfollow someone by adding a button to expanded tweets would help. More forcefully, Twitter could analyze which people you never @ reply, retweet, favorite, expand the tweets of, or visit the profile of. Then it could suggest that you unfollow them either in the sidebar or with an immediately accessible button on their tweets in the stream.
Twitter could also provide a feed-cleaning tool. It could rank who you follow by your engagement with them, and make it easy to bulk unfollow people you don't care about but who tweet a lot, or add to a List the people you interact with most. These tools will need to work from mobile, considering 75 percent of Twitter users access the service from their small screens.
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Para seguir a la gente y no verla mucho están las listas, ¿no? En todo caso, yo creo que los nuevos seguimientos se equilibran bastante con los que dejan de escribir, de forma que al final el número de Tweets (en mi caso) es más o menos constante.