I would suggest Steepshot. It is kind of link Instagram, but you can post a picture and then a short couple of paragraphs about it. It doesn't have to be a full on post. More than a sentence or two though so that it doesn't get spammy. That might be a great way for them to get started. Also checkout musing.io. It allows you to answer and ask questions all on the STEEM blockchain. The rewards are starting to get more decent too.