> I mean you listed several database libraries, static analyzers, and a code optimizer. Correct. > Is it your suggestion that those kinds of applications do n

> I mean you listed several database libraries, static analyzers, and a code optimizer. Correct. > Is it your suggestion that those kinds of applications do not require solid knowledge of a variety of different data structures and algorithms? No -- precisely opposite. Your response confused me quite a lot, but after some thought, I think I've realized how things have become mixed up. I took this for sarcasm: > Which innovation of Facebook are you describing? Instagram, WhatsApp, or the stories? Why did I take that for sarcasm? Because it is apparent to me that Instagram, WhatsApp and stories are not innovative. So I thought the main point of the poster I was replying to was to take a dig at Facebook. I didn't realize that we were in agreement about the importance of data structures and algorithms, but then I also didn't realize that we were still on that topic: my intention was purely to refute the [what I believed to be the implied] notion that nothing innovative was happening at Facebook.