Best PHP Framework for Social Media Start-up platform?

Hi guys,

We are developing a social network with some nice new features not seen yet. We are only two small elements away from our invite beta but we have come to see some challenges.

We have developed our own framework but recently we have been talking about moving to something opensource - like Laravel Framework.

Laravel came recommended to me by a friend but i wanted to hear what other developers might have of experience in this matter.

You can see our project live at www.nerdloop.com to get a view as to what it is we are creating and what framework might be good for it.

What are your experiences with use of PHP Frameworks??