Slide was begun as a project in 2004 and formed in 2005 by PayPal co-founder Max Levchin, who personally invested $1 million in the new company. Slide was one of the companies invited to participate in F8, the event at which Facebook announced an open platform allowing third parties to develop and operate their own software applications on the Facebook website. Many Slide applications were blocked in Turkey in March 2008 after a local court there ruled that Slide was not censoring user-generated content seen as derogatory to Mustafa Kemal Atatürk per Turkish law.