I saw that @johnspalding recommended Share2Steem below, and I just wanted to point out that another great option is Steepshot, an actual instagram-esque app you can download on iOS/Android that posts to the blockchain and has an intuative IG-style UI. For ease of use, I would think Share2Steem would be the way to go, but for looks/feel on the app and the formatting of posts Steepshot appeals more to me personally. In any case, welcome to our corner of the interwebs, there’s lots of ways to interact with this chain that are pretty cool - posting writing, videos, photos, music, etc. as well as tokenized exercise, games, and gambling apps. Hope you dig it here!