I put an open letter onto my profile as a note. Once people started reading it and commenting/liking it pretty much everyone I knew saw it.
I also copied the same letter as an email and, at the same time, sent it to the people I specifically wanted to ensure saw it, with a line or two at the start saying that I'd posted in on Facebox but that I wanted to be sure they'd seen it, for whatever reason.
Got lots of good feedback, the note stays on your profile so it doesn't get lost in and sort of timeline based thing or disappear into the ether after the date of an event passes nd isn't a group so I didn't have to arse about inviting people to it.
Worked a treat for me, and I had several people ask if they could share it with others that they thought would benefit from seeing what I'd said, which was cool.