I got this from a member on my B2ST page :)
This event created by @B2ST_eventday

1. Change your twitter avatar to the official picture below.

2. Change YOUR NAME (not username) to 카페인중독자_____ (your name on the blank; it means "Caffeine addict _____")

3. If Melon is available on your country, stream Caffeine MV

4. Trend the hashtag #all4yoseop on January 5, 2014 start from 00.00 KST

5. Mention Yoseob (on twitter) by saying "네게 카페인같은 존재가 될게, 생일 축 하해" + Whatever you want to say (It means "I will be something like Caffeine to you, happy birthday" + _________)

Trans cr. @amazingb2uty

Source: @B2ST_eventday