This section of the 11 tools made me think of "pen pals" from the days I was in school. I had like 3 and just loved getting their letters, pictures, posters and all the stuff that we shared with one another. I guess in the world of technology it could be called E-pals? I can see both of these programs being useful to students (especially older ones) for exchanging information, but especially for having access to experiences and knowledge outside of the classroom area.
Skype is a great tool! We use it to stay in touch with our family outside of Texas and the US.