Facebook fan page script

Hello guys i am new in PPD and decied to make website so i need script: When visitor enter the site he/she must share/like content on facebook or wait X second Please help what is the script name or if someone can send me in PM or post here , Thank you very much )))
sorry for bad english

Please help (((((((

This WordPress plugin might help you : Social Locker

Reference : http://wordpress.org/plugins/social-locker/