Dropbox in San Francisco today.

Dropbox's launch today in San Francisco was a big move, in addition to releasing the Android/mac version of mailbox, integrating personal and business accounts, and another photo management application carousel.

Carousel's photo storage management feature comes from Dropbox's acquisition of the photo company Snapjoy in December 2012. According to the Dropbox founder Gentry Underwood, the app can now automatically read photos of users in cell phone albums and Dropbox clouds and sort them by timeline. Apply the bottom is a time horizontal axis, can slide to view the picture at will. In addition, Carousel also main share function. Underwood says carousel can share hundreds of pictures with your email contacts in less than a second. Underwood gives Carousel the position of "one-stop content management". In other words, in addition to photos, carousel is likely to increase the user's video, notes and other content management.

For a software company, storage and sharing services are the best way to get new users and add stickiness to their users. This is why Facebook, Google and Twitter have been heavily involved in photo products. For cloud storage services Dropbox, for the above reasons, carousel also extends the product line for the company (and possibly even expands the potential revenue model). This is also Dropbox to prepare for the IPO in the agenda.