SteemIt is a social media site that rewards participants with a smart media token called STEEM. I've been using the platform and am writing an Introductory Guide to SteemIt.
There are several channels on SteemIt that offer fun contests which I've listed below.
The Trending Contests page shows information about existing contests. The Created Contests page shows all links related to contests. I will list interesting ongoing contests below. If you have a contest to suggest just drop a comment on my SteemIt Account and I will list it.