Can I share to Twitter/Facebook after a check-in? API for checkings/add contains a parameter broadcast which allows to sharing to connected Twitter account. But I don't know this information when sending a check-in, sharing to Twitter needs to be optional action after a check-in.
I have tried another checkings/add request with different broadcast afterwards, but it gets ignored (merged with previous check-in and it's not shared).
I need this for my app Glasquare (Foursquare for Glass). Implementation of my own Twitter/Facebook sharing would be tricky for me and the users, because it's not easy to authenticate a third party app on Glass (Glass doesn't have any keyboard to type username/password)
Unfortunately this functionality isn't currently supported in the Foursquare API. Perhaps have app-level user settings to let them toggle their broadcast option?