Mark your Calendars for Professor Wolfgang Nejdl‘s upcoming talk on Wednesday october 23 at 12:30 pm!!! The abstract of the talk is provided below “The Web stands for a huge and diverse infrastructure with an incredible amount of data. But what sets it apart from other infrastructures are its users: billions of users with very diverse backgrounds and goals who are shaping the Web. Humans introduce diversity into the Web, and work together creating amazing amounts of information, annotations and data sets. These different aspects of diversity create problems for our algorithms but also opportunities for coping with them, and I will illustrate this using some examples. I will further discuss current and future work at L3S related to Web Archives, building on projects currently running at L3S, including a new ERC Advanced Grant, ALEXANDRIA. Search and analysis in Web Archives are different from their counterparts on the Web and again involving humans is a crucial ingredient in coming up with good solutions. Within ALEXANDRIA, our goal is to significantly advance semantic and time-based indexing for Web archives using human-compiled knowledge available on the Web, to efficiently index, retrieve and explore information about entities and events from the past. In doing so, we will focus on the concurrent evolution of this knowledge and the Web content to be indexed, and take into account diversity and incompleteness of this knowledge. We will further investigate mixed crowd- and machine-based Web analytics to support longrunning and collaborative retrieval and analysis processes on Web archives. Usage of implicit human feedback will be essential to provide better indexing through insights during the analysis process and to better focus harvesting of content.”