Thanks for your questions.

The platform can encompass any content, whether it was originally yours or reposted.

Voters and posters are rewarded by the chain, similar to how miners are rewarded for securing the network.

The earlier someone up votes a post that becomes popular, the more the blockchain rewards them.

I invite you to come try out blogging on the site. You can develop an open channel, called a Streem, to manage a community of topical discussion, or you can develop your own blog through the handle you create.