Outside Services, like social media (Facebook, Twitter, etc.) and SmugMug can work together with Umbraco to allow your website to reach a larger audience. By utilizing appropriate media for content, such as photo galleries and videos, you can increase your website's presence as well as funnel in viewers that may not have been otherwise attainable.
These services allow for a much more engaging user experience through sharing, commenting, and tagging photos or videos. These are also another way to drive traffic to your website.
Social media (such as Facebook) is a great way to create an extension of your presence beyond your website, and present interactive content, such as tagged photos.
SmugMug is a photo storage service that will allow you to upload large galleries of photos, and make them available to share on your websites, and allow your users to download high quality versions of those photos for free.