Five things to announce on Twitter and Facebook
1) The phone topic you’ll be discussing later in the show. (Get online comments to read on-air.)
2) The time your next live remote begins — and the great prizes you’re giving away only to those who follow you on Twitter and Facebook.
3) A direct link to the page where followers can hear your latest, greatest bit, or view your new show video.
4) A link to the image you just snapped at your live event and uploaded to TwitPic.
5) Emergency weather bulletins, with a reminder to tune to your station “now” for continuing local updates.

i think you should post anything that you think is of intrest and reflects your personality or intrests.
Great ideas. Thanks for sharing. I’ve been using most of these ideas already. Just nice to see someone else confirm it.