Care for a Slurpee that gives you point on FarmVille? How about a Mafia Wars hashbrown? 7-Eleven and Facebook games producer extraordinaire Zynga have teamed up to add some spice (or quench some thirst, or satisfy some sweet tooth) to a massive new ad campaign Zynga is launching by offering products that also provide in-game bonuses to Zygna game players. Zynga is also starting print and radio advertising for their games. The promotion begins June 1st.