This is a blog post equivalent of qualitative user research, which, in addition to quantitative methods, is really useful to understand why people are using technologies the way they do. Research and understanding usually starts from small samples and anecdotes and expands from there via more rigorous methods towards the truth.
Also, the teenager polled was asked about apps and services they use socially which actually expands the pool of data considerably.
This isn't "what is your favorite ice cream" which is a purely personal-singular choice. This was "what do you and your friends do" which expands greatly the number of responses.
