Given the task definition and input, reply with output. In this task, you are given a context tweet, a question and corresponding answer of given question. Your task is to classify given passage into two categories: (1) "yes" if the given context is useful in answering the question, and (2) "no" if the given context is not useful.

Context: @MattRosoff Ah: They tracked the UUID of the device to tie multiple Uber accounts to the physical hardware. Not tracked physically via location svcs. Alan Danziger (@alandanziger) April 23, 2017 Question: what was it not tracked physically via? Answer: location services
yes