I figured it out. The answer is to pass a JSON object into the properties
parameter:
var p = {
"Look at details": {
"text": "here",
"href": "http://www.google.com"
}
};
FB.ui({
method: 'feed',
name: 'Los Angeles, CA, United States',
caption: 'The current condition for Los Angeles is Fair.',
description: 'Temperature is 58°F.\nLook at details: <a href="www.google.com">here</a>',
link: 'www.google.com',
properties: p
}, function(response){});