| Vol-382 Copyright © 2008 for the individual papers by the papers' authors. Copying permitted for private and academic purposes. Re-publication of material from this volume requires permission by the copyright owners.

#
SIRTEL'08
Social Information Retrieval for Technology Enhanced Learning

### Proceedings of the 2nd SIRTEL'08 Workshop on
Social Information Retrieval for Technology Enhanced Learning
Maastricht, Netherlands, September 17, 2008

Edited by

### Riina Vuorikari, European Schoolnet(EUN), Belgium
Barbara Kieslinger, Centre for Social Innovation(ZSI), Austria
Ralf Klamma, RWTH Aachen University, Germany
Erik Duval, Katholieke Universiteit Leuven (K.U. Leuven), Belgium & ARIADNE Foundation

## Table of Contents

### 1. Tags and Folsonomies

- Comparison of educational tagging systems - any chances of interplay?
  Riina Vuorikari, Hans Poldoja

### 2. Impact of SIR in TEL

- Using Simulations to Evaluate the Effects of Recommender Systems for Learners in Informal Learning Networks
  Hendrik Drachsler, Hans Hummel, Rob Koper
- Microblogging in Technology Enhanced Learning: A Use-Case Inspection of PPE Summer School 2008
  Cristina Costa, Guenter Beham, Wolfgang Reinhardt, Martin Sillaots

4-Sep-2008: submitted by Barbara Kieslinger
5-Sep-2008: published on CEUR-WS.org