Tumblr is a blogging experience that’s similar to Twitter, but more focused on the user itself than on the central feed.

• You have your blogs and you post there. Yes, you can have many blogs.
• There’s global feeds with posts from all users, potentially including yours.
• Posts can have non-intrusive hashtags, meaning they are not #partOfThePost, but in a separate, smaller, dedicated section of the post.
• You can’t post stuff to someone else’s blog, but you can comment on their posts. Comments are tiny next to the post.
• You can quote posts, but that makes a duplicate in a blockquote rather than linking to the original post like Twitter