Targeting legilsators?

We all know Facebook has cracked down on social/political issue advertising. I’ve explained many, many times how it’s virtually impossible to target policymakers directly, but long story short, I’m working on providing some options and want to make sure I’m not overlooking anything – or have something wrong!

Right now, I’m primarily recommending geotargeting their district offices as well as the state house as an area they frequent/are interested in.

I know that Twitter offers custom audiences, but that’s limited to users who have already opted in to receive your communications – just like Facebook – right?