Facebook bots from a desktop?

Anyone know why you cant “invoke” facebook bots from a desktop browser?

Its weird after reading this article http://brandequity.economictimes.indiatimes.com/news/digital/yahoo-unveils-four-bots-for-facebook-messenger/53126105  i fired up my desktop browser (on left) but you cant initiate a chat with the @YahooWeather at all….fire up mobile messenger app….yep works straight away.

Any thoughts? has anyone built a POC to see whats involved? What sort of takeup are you seeing?

Are users coming back?

Can you generate enough website traffic to justify the costs/effort involved?