Smart Communications is offering a new Unli Social Plan 349 which offers unlimited SMS within the Smart network, and unlimited access to Facebook, Twitter and Yahoo! Messenger. Facebook and Twitter access is only allowed through the Smartnet app. If you access Facebook or Twitter through a web browser or apps other than the Smartnet app you will be charged Php10 per 30 minutes of use. Clicking links posted in the Facebook or Twitter feeds will also result in web browsing charges.
Basically, while the plan is limited, it does come bundled with a free Android phone and you can post and read Facebook and Twitter, and message through YM to your hearts content.