Clicking the Settings Icon in Hootsuite Campaigns let’s you specify things like how often people can submit entries. When you’re getting started, a good rule of thumb is to:
A) Let people submit as many entries as they wish; this will engage your most motivated contestants
B) Hootsuite Campaigns sets this number automatically for you; it’s not user-specifiable
C) let people submit only one entry for the life of the campaign; allowing more may put you in breach of a social network’s Terms of Service agreement
D) let people cast one entry per day; this will keep dedicated fans coming back, without overwhelming the campaign
https://www.youtube.com/watch?v=C5po4OjqFD4