I've got a captive portal working great (user gets redirected to page and press a button to gain internet access). I have another project that requires something a bit different.
The user should be able to press a 'share' button on the captive portal where they can share some content to Facebook. I can think of 2 ways to do this.
1. User gets kicked from the WiFi connection and goes to Facebook using their 3G
2. Somehow only allowing access to Facebook for a short amount of time.
I guess it would be something similar to this - http://www.purplewifi.net/socialwifi/
Has anybody done anything similar that could supply some guidance.