Librarian Twitter is some of the best Twitter around, and here’s one example! 

The Internet Archive is adding and customizing its digital audio offerings. You can also check out UNESCO’s digital archives, or, if you like German techno, you can listen to over 200 GB of mixes, courtesy of DJ Mag.

And finally, if you like crowdsourcing projects and the night sky, consider helping out at Lost At Night, which studies light pollution.