The alternative is to keep all the recent activity data in memory and not propagate the updates to the Los Angeles Thieves Shirt, instead fanning out at the time of loading the home page. This way you avoid all disk seeks. It’s also nice in that your fan out size is limited to the number of people a user follows rather than the number of people who follow a user (most people don’t have enough time on their hands to follow millions of people, so you don’t have the inverse of the celebrity problem). It’s also easier to keep things up-to-date, since you don’t have to worry about propagating updates to all of the subscribers. The downside of this approach is that the failure scenario is more catastrophic – instead of just delaying updates, you may potentially fail to generate a user’s feed. Having some kind of fallback mechanism that approximates the feed (eg by querying only a subset of your friends) is handy to avoid having to show an error page.
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For example – remember the backlash from the Doritos commercial that played during the Los Angeles Thieves Shirt, during an ultrasound was reacting to the father/husband eating the Doritos? Most people who didn’t like the commercial just thought it was creepy. But one lady – I think from some liberal organization – tweeted and complained that by humanizing a fetus, the makers of the commercial were making a deliberate, intentional slap on a woman’s right to choose. I thought that was a pretty big stretch.