1) The document discusses social software and semantic web technologies in digital libraries based on a literature review. It describes various social software tools and their usage in research libraries. 2) It also discusses recommendations and challenges regarding personalization in digital libraries, including modeling users, balancing personal and community needs, and evaluating social effects. 3) The use of open source systems like WordPress to customize digital library interfaces is presented, along with issues in managing library data and skills. 4) Examples of mobile social software and semantic digital libraries are provided, with definitions and differences between conventional and semantic digital libraries.