The authors present in this work information about social media and
data mining usage for that. It is represented information about social networking sites, where Facebook dominates the industry by boasting an account of
85% of the internet users worldwide. Applying data mining techniques to large
social media data sets has the potential to continue to improve search results for
everyday search engines, realize specialized target marketing for businesses,
help psychologist study behavior, provide new insights into social structure for
sociologists, personalize web services for consumers, and even help detect and
prevent spam for all of us. The most common data mining applications related
to social networking sites is represented. Authors have also given information
about different data mining techniques and list of these techniques. It is important to protect personal privacy when working with social network data. Recent publications highlight the need to protect privacy as it has been shown that
even anonymizing this type of data can still reveal personal information when
advanced data analysis techniques are used. A whole range of different threat of
social networks is represented. Authors explain cyber hygiene behaviors in social networks, such as backing up data, identity theft and online behavior
