Mod The Sims (formerly ModTheSims2, often abbreviated as MTS) was founded by Delphy in May 2004 after he and Aobh previously created "Mod the Singles", a forum-based site for hosting and encouraging modification of the game Singles: Flirt Up Your Life, a dating-oriented clone of the blockbuster The Sims. It runs on vBulletin 3.0.14, with certain hacks added. MTS focuses on custom content for The Sims 2, The Sims 3 and The Sims 4, most notably game modifications.