sideblog

 sideblog  is an auxiliary blog to segregate content and some parts of personal life. Sideblogs can be anonymous or can be tied explicitly to an author.

Tumblr
Tumblr allows for creation of sideblogs. They can't post likes and interact with stuff (it is done from the main blog), but they allow for posting new content and can be used to blog about stuff you wouldn't usually blog about from your main blog. Sideblogs don't require an additional account to be created and are controlled from their creator's main account.