How do I cut off friends that don't contribute to my life?

Read also:

• What are some small, random things that annoy you to no end?
• What are some ways to adjust to sleeping with one's mouth closed if they have been breathing through their mouth due to snoring and obstructive sleep apnea (OSA)?
• I read this: "Putin is a brilliant, courageous, ingenious, determined, beloved, and incredible modern leader. He is currently the world’s most effective and strong leader, the best the world has seen in centuries." What do you think about this?
• Wicked: For Good trailer transports fans back to Oz - BBC
• Marco Rubio sanctions ICC for targeting US and Israel - BBC
• What is the reasoning behind conspiracy theorists claiming that there were multiple shooters involved in the JFK assassination?
• Why do I randomly start sweating a lot in public (while waiting in line, in a new class, etc.) then start sweating more because I’m embarrassed that I’m sweating so much? Is this social anxiety?
• Knicks get Jay Wright clarity in their head coach search - New York Post
• As it happened: Breakaway holds on for victory ahead of GC contenders on the final stage of the Critérium du Dauphiné - Cyclingnews
• Bond Yields Keeping Climbing. Governments Can Bring Them Down. - Barron's