TITLE: Graph algorithms and systems at Twitter ABSTRACT: The Twitter follow graph is asymmetric, large and exhibits interesting characteristics of both a social and an information network. It is also full of information that can be mined for a variety of applications. This talk presents some of the interesting and challenging aspects related to this graph, including the systems to manage it at real time and analyse and mine it at scale, some of its somewhat unique structural characteristics as well as some useful graph processing primitives and algorithms used in Twitter's search and discovery engines.