“…Social network services created on the basis of Web 2.0 ideology in a very short period of time, in the last decade, turned into a social media generating and distributing unique content from a convenient tool for communication and file sharing [1]. Today, social media includes blogs (Blogger, LiveJournal), micro-blogs (Twitter, FMyLife), social networking services (Facebook, LinkedIn), wikis (Wikipedia, Wetpaint), social bookmarking (Delicious, CiteULike), social news (Digg, Mixx), reviews (ePinions, Yelp), multimedia sharing (Flickr, Youtube).…”