Hi Patrick ~
There are scams on Trulia and other real estate related websites because people fall for them and the scam artist makes money. You are lucky in that you are astute enough to recognize a scam when you see one.
If you are looking to rent in Chicago, please do contact me at email@example.com. I would be more than happy to chat with you about neighborhoods in which you would like to live, costs and availability of units in those areas.
Again, my contact info is firstname.lastname@example.org.
Best to you