According to the Steemit blog post, Steemit has launched a new engagement challenge, Season 18, Week 5, to encourage users to participate in various activities such as posting, commenting, and voting. The challenge runs from June 17th to June 23rd and offers rewards for top participants. To participate, users need to complete daily tasks, such as posting at least one article per day and commenting on at least three other posts. The top 10 participants will receive rewards, including Steem Power and Steem Dollars.