What are the limitations of telepresence robots?

When a robot resembling a vacuum cleaner topped with a computer monitor rolls by you a t work, you might at first think it is cleaning carpets. But if it stops to say hello, and you see a coworker's smiling face on the screen, the device is probably a "telepresence robot." Many organizations are experimenting with ways to improve collaboration for remote workers, and these robots are making a contribution.