Is there a way to "Find My Friends" from the desktop, rather than iPhone? I would like to access "Find My Friends" from the desktop.

Also, is there an API available? I'd like to write code to monitor a person's location over time.
On MacOS 10.10, "Find My Friends" can be accessed by clicking "Details" when viewing a friend in the Messages application.

You can also share screens via "Details" as well, from the desktop Messages app.