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

Read also:

• Is there any way that I can sign up for multiple newsletters from as many companies as possible at once using a single form?
• Where's Marty McFly's guitar? Search is on for 'Back to the Future' prop 4 decades later - NBC News
• Scientists make stunning discovery hidden along 2,000-mile stretch of ancient Antarctic mountains: 'More dynamic … history than previously recognized' - Yahoo
• Natural Compound in Rice and Coffee May Protect Against Heart Attacks - SciTechDaily
• Why in my 60s do I have a strong desire to suck cock and swallow?
• I have permed hair in need of some deep moisturizing. If I use a product like Pro K pac as a leave-in conditioner and don’t rinse it out for 24 hours, will my hair be damaged?
• How would you feel if your girlfriend had dick pics on her phone?
• New Genus Of Jumping Spiders Found In New Zealand's Mountains, And They May Have Ballooned Their Way There - IFLScience
• Six Types Of Dinosaur Eggs Found In One Place - The Daily Galaxy
• JPMorgan’s Jamie Dimon Sees Bond Market Crack — Why And What To Do - Forbes
• Why did McLaren hope that the Ferrari pair would pit twice during the Italian Grand Prix?
• The First in 30 Years: Scientists Discover New Class of Antibiotics - SciTechDaily
• United-JetBlue Tie Up Leaves American Airlines Bloodied - Live and Let's Fly