A few missing / dead links

Just tried to visit every link listed, here are some that seem to be dead

Reddit:

• /r/ShamelessPlug - https://www.reddit.com/r/shamelessplug/

Websites

• Boing Boing - http://boingboing.net/sub/ - BoingBoing is still active but this link does not go to submissions page
• BuiltInChicago - http://www.builtinchicago.org/send-us-tip - active but link is incorrect
• Discova - http://www.discova.co/ - blocked by adblocker
• Loop - https://app.loopinput.com/ - down
• SideProjects - https://sideprojects.net/ - down
• Software Advice - https://softwareadvice-markets.questionpro.com/ - down
• Startup Benchmarks - https://www.startupbenchmarks.com/ - down
• Startup Register - http://startupregister.net/register-your-startup/ - down
• State of Tech - http://stateoftech.net/advertise?submit-an-app-for-review - down, redirects to dailylearn.com
• The Changelog - https://github.com/thechangelog/ping - no longer in use
• Top Alternatives - https://topalternatives.com/ - down - blank WP site

Search the repository for each URL listed in the issue and inspect the surrounding entries in the startup-links list. Verify the reported redirects, outages, or incorrect destinations, then update or remove affected links and check the rendered list for working destinations.