Just have to register on Facebook, share on Twitter but once you do you can get 4 free games!
The games will pop up as codes which you can download from the PS Store.

The games are:

1. Velocity
2. BreakQuest
3. Canabalt
4. Wizorb

These games also work on PS3 and Vita.
I believe you need an EU or UK account to redeem them.

Here is the link: https://www.facebook.com/SonyPlaysta...38718762805824