I think it highly depends on the learning purposes. Some kind of researches are made easy by content search applications, and the social networks are very helpful to communicate and disseminate relevant content. In the other hand search applications can be used to plagiarize, and social networks can became a source of distraction, as Norah just said. A communication app, like Whatsapp may disturb a tradicional lecture, but the same application can be usefull in an e-learning discussion, for example.
To sum up, it all depends on the learning objectives, user/student needs and the enviroment where the tecnologies are being applied.
I use all of these applications in the enviroments above, by the way, ;)
Davi: Yes! It does depends on the purpose for some. I've used research gate as tool ask people about certain research topics and I've gotten some good feed back
The following publications relate to the use of mobile technologies - netbooks, iPhones or iPods and student learning. Hope these are useful for you.
Regards, Kevin
Martyn, J., Larkin, K., Sander, T., Yuginovich, T., & Jamieson-Proctor, R. (2013). Distance and devices — Potential barriers to use of wireless handheld devices. Nurse Education Today 34(3), p. 457- 461 http://dx.doi.org/10.1016/j.nedt.2013.04.021
Larkin, K. (2011). You Use! I Use! We Use! Questioning the orthodoxy of one-to-one computing in primary schools. Journal of Research on Technology in Education, 44(2), 101-120.
Larkin, K. & Finger, G. (2011). Informing one-to-one computing in primary schools: Student use of netbooks. Australasian Journal of Educational Technology, 27(3), 514-530.
Larkin, K. & Finger, G. (2011). Netbook computers as an appropriate solution for one-to-one computer use in primary schools. Australian Educational Computing, 26(1), 27-34.
Jamieson-Proctor, R. Larkin, K. (2012). Transforming learning using iPods and Web 2.0 tools. In 2012 Australian Computers in Education Conference: ITs Time: Information Technology in Schools Time (ACEC 2012), 2-5 Oct 2012, Perth, Western Australia.
Jamieson-Proctor, R., Larkin, K., Albion, P., Redmond, P., Fasso, W. (2012). Distance learning at times and places chosen by the learner: Adapting resources and learner behaviours for working with mobile digital devices. In 2012 Australian Computers in Education Conference: ITs Time: Information Technology in Schools Time (ACEC 2012), 2-5 Oct 2012, Perth, Western Australia.
Albion, Peter, Jamieson-Proctor, Romina, Redmond, Petrea, Larkin, Kevin, & Maxwell, Andrew. (2012, 25-28 Nov 2012). Going mobile: each small change requires another. In: ASCILITE 2012: 29th Annual Conference of the Australasian Society for Computers in Learning in Tertiary Education: Future Challenges, Sustainable Futures, 25-28 Nov 2012, Wellington, New Zealand.