Panagiotis Takis Metaxas

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Using social media for political discourse is becoming common practice, especially around election time. One interesting aspect of this trend is the possibility of pulsing the public’s opinion about the elections, and that has attracted the interest of many researchers and the press. Allegedly, predicting electoral outcomes from social media data can be(More)
Using social media for political discourse is increasingly becoming common practice, especially around election time. Arguably, one of the most interesting aspects of this trend is the possibility of ''pulsing'' the public's opinion in near real-time and, thus, it has attracted the interest of many researchers as well as news organizations. Recently, it has(More)
Finding the connected components of an undirected graph G V E on n jV j vertices and m jEj edges is a fundamental computational problem The best known parallel algorithm for the CREW PRAMmodel runs inO log n time using n log n processors For the CRCW PRAM model in which concurrent writing is permitted the best known algorithm runs in O log n time using(More)
We present a simple and implementable algorithm that computes a min imum spanning tree of an undirected weighted graph G V E of n jV j vertices andm jEj edges on an EREW PRAM in O log n time using n m processors This represents a substantial improvement in the running time over the previous results for this problem using at the same time the weakest of the(More)
In recent years several researchers have reported that the volume of Google Trends and Twitter chat over time can be used to predict several kinds of social and consumer metrics. From the success of new movies before their release to the marketability of consumer goods to the prediction of voting results in the recent 2009 German elections, Google Trends(More)
Social media today provide an impressive amount of data about users and their societal interactions, thereby offering computer and social scientists, economists, and statisticians – among others– many new opportunities for research exploration. Arguably, one of the most interesting lines of work is that of predicting future events and developments based on(More)
Web spamming, the practice of introducing artificial text and links into web pages to affect the results of searches, has been recognized as a major problem for search engines. It is also a serious problem for users because they are not aware of it and they tend to confuse trusting the search engine with trusting the results of a search [16]. The parallels(More)
Social networks such as Facebook and Twitter have become the favorite places on the Web where people discuss real-time events. In fact, search engines such as Google and Bing have special agreements, which allow them to include into their search results public conversations happening in real-time in these social networks. However, for anyone who only reads(More)
Social networks such as Face book and Twitter have become the favorite places on the Web where people discuss real-time events. In fact, search engines such as Google and Bing have special agreements, which allow them to include into their search results public conversations happening in real-time in these social networks. However, for anyone who only reads(More)