From Sonys Ghostbusters Twitter account:
The following day (yesterday) Ghostbusters posted the first Ghostbusters competition.
Based on the first one where Sony/Ghostbusters wants to see your “ghostbustin'” pet, safe to assume the competition with other ghostheads (if it involves photos) is to see who they feature.
Depending on what the weekly competitions are and how the schedules are around here we may or may not post about every competition. Also safe to assume Sony Pictures Entertainment will run these competitions either until Ghostbusters (2016) premieres or right around that time.