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Abstract-Microblogging services such as Twitter and TencentWeibo have enjoyed drastic popularity in the latest few years. Recommender is essential to those microblogs as a means to find items (users or other information sources such as organizations) that might interest a user to follow. It can greatly improve user experience as well as reduce the risk of information overload might be introduced by irrelevant followees. In this paper, we examine some of the most influential factors that user might consider in selecting followees, in the hope of recommending interesting items to match each user's preferences. We investigate a large scale microblog data extracted from Tencent Weibo and conduct the evaluation of recommendations based on the guideline proposed by the challenge of Track 1 in KDD Cup 2012. Statistical analysis of the log of user actions regarding to recommendations reflect only about 7% acceptance. Experimental results show the popularity of an item is more attractive to users than other features such as the matching of item category, keywords and the influence of user actions and current followees' acceptance.

Several operations in the Exploration and Production (E&P) sector are event-driven in nature and are supported by specialized systems and applications. Narrow focus of applications results in application silos that restrict the information sharing across verticals, which is a critical requirement for coordinated cross-functional efforts. Effective response to events warrants due emphasis on an integration strategy that facilitates desired information flow across verticals. Event-driven methods can be used to make strategic asset management decisions across silos in real-time, thus reducing response time and costs while improving asset performance.Complex event processing is an emerging research area that involves detecting complex events, processing the events, deciding actions for each event and notifying the relevant personnel about the event. In the E&P sector, the adoption of CEP and messaging-based systems in conjunction with semantic methods can facilitate components of the oilfield to communicate in real-time across different software platforms. Such an approach helps not only in detecting complex events across various sources, but also in processing them and deciding the actions to be taken, with the help of a knowledge base -thereby reducing information overload.Consider a typical application scenario -a pump failure event in an oilfield, which should elicit response not only by the pump operator but also by the maintenance engineers, production managers, reservoir engineers and other involved personnel. A proactive event-driven system enables quick detection of the failure across heterogeneous data sources and takes corrective actions while notifying the appropriate personnel. This facilitates effective communication across the teams and software systems involved.We propose a semantic complex event processing architecture for the digital oilfield that facilitates enterprise information integration. We delineate an illustrative use case of such integration for production optimization. Value propositions of the proposed framework include efficient interaction patterns, reduction in data seeking efforts, faster response times, building of consistent best practices and management by exception.