In another thread here, the author of "TimeCap" mentions their iOS app. I just downloaded it and am currently trying it. It blocks a lot of the junk. I've only used it for 4 or 5 minutes now, but it does a lot of what I'm looking for, so it's worth a look. There is a fee ($30/yr or $3/week) so I'm currently trying the $3/week to see if it's what I want.