In my research of this space, I have come across these texts which have aided my own in-depth education. Please let us know if there are any we have missed and should add for benefit of the global community of practitioners.
1. The Use of Technology in Mental Health (2010): http://www.amazon.com/Use-Technology-Mental-Health-Applications/dp/0398079544/ref=sr_1_1?ie=UTF8&qid=1458818281&sr=8-1&keywords=the+use+of+technology+in+mental+health
2. Mental Health in the Digital Age (2015): http://www.amazon.com/Mental-Health-Digital-Age-Dangers/dp/019938018X/ref=sr_1_2?ie=UTF8&qid=1458818163&sr=8-2&keywords=digital+in+mental+health
3. Mental Health Practice in a Digital World (2015): http://www.amazon.com/Mental-Health-Practice-Digital-World/dp/3319141082/ref=sr_1_3?ie=UTF8&qid=1458818163&sr=8-3&keywords=digital+in+mental+health