Yeah, let's make things more complicated yaay! Filters, and more filters - now I have to remember exactly which one does what.
Stop thinking like an engineer and think like a non-technical common user.
Stop thinking like an engineer and think like a non-technical common user.
Being a non-technical common user doesn't mean you don't need better filters; it means the service needs to make it easier for you to explain to it what you do and don't want to see. You don't even have to expose the word "filter" to the non-technical people, but the filters need to be there conceptually, nonetheless.
Note that I'm not saying this is easy... I'm saying this is the challenge that G+, Facebook, Twitter, etc. need to take on and solve. As opposed to the challenge of "how do we not let people post stuff." That's easy, and it's a cop-out.
Now, adding a large group of people to a Twitter list via web Twitter is such a painful exercise, I often turn to an API solution (tweetbe.at in particular) to do it.