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 * [david malans cs75 scalability talk](https://www.youtube.com/watch?v=-W9F__D3oY4&list=PLmhRNZyYVpDmLpaVQm3mK5PY5KB_4hLjE&index=10)
 Feel free to go through other lectures if needed. 
 
-* [david huffman's talk , scaling up talk](https://www.udacity.com/course/web-development--cs253) ([Youtube link](https://www.youtube.com/watch?v=pjNTgULVVf4&list=PLVi1LmRuKQ0NINQfjKLVen7J2lZFL35wP&index=1))
+* [Steve huffman's ,Reddit scaling up talks](https://www.youtube.com/watch?v=pjNTgULVVf4&list=PLVi1LmRuKQ0NINQfjKLVen7J2lZFL35wP&index=1)
 
 * [scalability for dummies](http://www.lecloud.net/tagged/scalability)