Drop.io is a service that lets users create a "drop" where they can share documents, videos and other digital content. The user can set a time for how long the drop will exist, decide who can view the content, set permissions for who can alter the content and share content in a variety of ways, including on Facebook.

Drop.io has positioned the service as one that is ideal for real-time collaboration because people can add new content to a drop and the people they are sharing it with see it immediately, without having to refresh their browsers.

Also, when multiple people are viewing a drop simultaneously, they can communicate in several ways within the drop, including via an instant message client.

With the acquisition, drop.io will be shutting down the service. The company did not say what it thinks will happen to the technology under Facebook.

Facebook bought "most of drop.io's technology and assets," and the company's founder, .