On World Oceans Day, I asked the online marine science and conservation community to tweet their favorite facts about the ocean using the hashtag #OceanFacts . Dozens of people joined the discussion, and more than 300 #OceanFacts were contributed. These tweets cover a variety of topics, from marine invertebrates, fish, sharks, and marine mammals to facts about the ocean itself and conservation policy. The discussion also inspired a great deal of humorous posts, including an entire spinoff #OceanFibs hashtag. Some of my favorite #OceanFacts tweets are saved in the Storify below.