This can be found on facebook
AS OF JAN 25 2011 IT WORKS ON GOOGLE CHROME AND FIREFOX/MOZILLA
I DIDN'T TRY IE, OPERA, OR SAFARI FOR PC.
1. Click the Suggest to friends button.
2. RIGHT CLICK THE "FRIEND BOX" AND SELECT FRAME IN NEW TAB
3. Paste this code into your address bar.
javascript:fs.select_all()
4. Press enter and see all your friends be highlighted.
5. Press Send Invites. (YOU MIGHT HAVE TO DE-SELECT 1 FRIEND AND PRESS INVITE AGAIN. DON'T WORRY IT WILL ONLY SEND IT OUT ONCE)
I invited 2174 at once
After all your friends are invited the invite box friends will be greyed or un-highlighted - MEANING IT WAS SUCCESSFUL
If you check back later and some of your friends are not grey anymore it means they either joined or ignored your invite
I would suggest not to send a message along with suggesting they join a page or event it might be considered spam especially if you have a lot of friends
