One phenomenon which Facebook takes into account which Twitter does not is that of the loquacious acquaintance, possibly someone with a business constantly hyping things, possibly someone who just likes to hear themselves speak more often than I do. They apply slight pressure to me to follow them on Twitter or friend them on Facebook so I do so.

On Facebook I can easily set people to three settings which are private to me - read everything they write, read only significant things they write (things which get more than ordinary likes/replies, or whatever), or ignore them. This is great for me, otherwise my entire Facebook feed would be filled with my 4-5 chattiest friends or current/former coworkers, I'd have to scroll through their collective 10-12 posts a day to see anyone elses, etc.

Twitter does not have this option where I publicly follow someone, due to them pressuring me to follow them on Twitter, but where I can actually privately ignore them. Which just tends to mean I use Twitter less. Maybe there is an option buried somewhere where I can do this, but it's definitely not obvious like on Facebook. Which just means I use Twitter a lot less. Because all it is for me is a constant stream of 4-5 chatty acquaintances with the dozens of others I follow popping in once in a while.

There are ways to deal with this on Twitter, but none of them are that good. I can create another account, but then there are problems from that - accounts with private tweets I no longer have access to or have to ask for two adds from everyone etc. I can create a private list without these people on it, but then I have to go to the trouble of maintaining two lists - the main list and the private list. Facebook just makes this a lot easier.