Yes, going by user name.
If they don't allow e-mails, I use the contact feature, if they DO allow e-mails, i do that. If they block everything, then I cross them off my list and move on.
We certainly won't be able to reach everyone, but every one we reach is a success.
I'm alerting them to the petition and website and also asking if they'd like to tell their story for the press pack.