I believe, if you message them, it will show up in the top right hand corner. If they notice it, they can message you back. Seems a lot like instant messaging just without the pop up window of the message.
Hi Chicken owners from the St. Paul area,
I am on another board and saw this this evening...
"We found a lost hen tonight down by Aide Mill Rd. She seems healthy and looks to be about 17 weeks.
Please claim we don't have the room for her in our coop."
If it is yours, I will get you in touch...