Facebook Expands Event Mapping Features

For a while now, Facebook has enabled users to include a link to event locations via Google Maps. At some point in the past few days Facebook expanded the mapping functionality to now include Mapquest, Microsoft maps and Yahoo maps. Why did they decide to expand the mapping functionality? No word but I would guess that at a minimum Microsoft wanted to be included. Given that they are one of the largest investors in Facebook (largest in terms of dollar amount) they definitely have some sway when it comes to changes to the site.