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Welcome to pump.io!
I'm in the mobile phone, so I'll answer you with more detail later.
For now, you may find useful the “User Documentation” in http://pumpio.readthedocs.io/en/latest/
Follow some people to receive their posts in your timeline. For example, you can go to https://identi.ca/jankusanagi and have a look to his “Meanwhile” column, he comments a lot in recent posts from many other people, so you can have a look to those posts, and follow their authors.
Christopher Allan Webber likes this.