Just like the Web 2.0 has transformed the Web and the
way people use theWeb, we believe thatWeb 2.0 has the potential
to transform research in technology-enhanced learning.
We base this claim on two observations: rst, on the
wealth and variety of Web 2.0 services that are available
today, and second, on the low complexity of exploiting the
functionality of the services by APIs, which allows to implement
functionality on top of these services.