Facebook’s Messenger Platform is now open for standard messaging, with business and developers having a 24-hour window to respond to messages initiated by users of the social network’s messaging application. Facebook’s Product Manager, Seth Rosenberg, announced the update in a blog post, saying that subscription messaging is still being tested. Rosenberg stressed that Messenger users will not suddenly find themselves bombarded by messages from brands, saying that all conversations must be initiated by users, and those users can mute or block businesses at any time. He added that more information on those controls is available here. The news signals that the increasing use of bots by brands on the platform is not only set to step-up, but will become standard practice for brands over the coming months.