Pass in User ID in Shortcode

Hi there,

– I would like to know if it’s possible to retrieve ad listings by the ad posters user id, passing it into the [aol] shortcode as an argument.

for example [aol posted_by=”365″ type=”ad” excerpt=”no”]
And if it’s empty, it shows the default empty message.

– Lastly, is it possible to post ads in the front end

regards