Mostly humans, who follow me and my posts, when it pops up. Welcome on steem. There are bots with different roles. If you are a programmer, you can start your journey coding. Steem is a blockchain. steemit is just the first app on the steem blockchain, where things posted show altogether. There are already up to 500 apps on the steem blockchain (you can find this on steemprojects.com). all various activities from these apps, even some tests show on steemit.com

So not only actual blogs. What is reward is value. content as in blogs is one form of content. I created another form of content called ulogs for instance and building the app for it on ulogs.org 
also for freelancers and dream-builders, something is building up for that on steemgigs.org

If you are coder etc, leave a comment or comment your interest, i will tell you where to start. or an app to use. if you like to walk etc there is @actifit, you want to review products, there is @steemhunt. you want to livestream or upload videos there is d.tube as you can see the video was uploaded to dtube. there is also vimm.tv building up etc