How was Periscope app built?
A lot of users asks me how Periscope is being built. The most honest and logical answer is to take a look at the Legal section of the app and then go to Attributions (in iOS app).
You will see something like this:
If you scroll down you will see all the technologies used to create this app.
It is a good starting point in case you want to create your own Streaming app.