Post your comment is real time. This means that as soon as you click Send, your comment will appear on the page.
Examples of comments:
Anyone interested in a ride next Tuesday afternoon starting at 5:30?
I need carpooling to the ? event ride in Lancaster. Anyone have space?
Looking to change out my wheels. Need feedback, what works for you?
Include your contact info in the Post so that people can get back to you.

You can also have a real time discussion with someone on the site.