Boosting - you can pay an account with a lot of Steem power to vote for your posts, giving them a quick uplift and getting them more visibility. There is lots of discussion around the pros and cons of doing it - and in the last couple of days one of them - bellyrub - has been exposed as a potential scam
Check this site for more info: https://s3.amazonaws.com/yabapmatt/bottracker/bottracker.html
Having said that, with the attention your posts are getting I don't think you have any need for them