To pay tribute to Steve Jobs, Co-founder, Chairman and CEO, Apple Inc who died last year, Apple fans all over the world are expected to wear a black turtleneck one day this week (June 11-15).

In honor of Apple's World Wide Developers Conference (WWDC) this week, ChallengeLoop is issuing a challenge to all Apple fans to pay tribute to Steve Jobs. Developers attending the conference and Apple fanboys everywhere can show their support by taking the challenge and wearing a black turtleneck any day during WWDC

ChallengeLoop launched its iPhone app and website last Friday. The app makes it easy for users to challenge their friends and even themselves to anything and will feature the Steve Jobs Tribute Challenge all week to make it easy for people to share their experiences with photos and videos.

ChallengeLoop was built to tell the story of all types of challenges, whether it be the Steve Jobs Tribute Challenge, a fitness challenge, a comeback win in a competition against a friend or accomplishing a lifelong goal.