How successful is hypnosis or hypnotherapy over a distance, for example, over Skype? Some hypnotherapists offer healings over the internet, whereas some other don't. I'd like to know how successful is hypnosis or hypnotherapy over a distance, for example, over Skype?
A literature review was conducted Barak et al. (2008) that compared the effectiveness of internet-based psychotherapy in general (not specifically hypnosis). From their abstract, the results indicate that:


  The overall mean weighted effect size was found to be 0.53 (medium effect),
  which is quite similar to the average effect size of traditional, face-to-face
  therapy.


Following, they


  [...] examined interacting effects of various possible relevant moderators of the effects of online therapy, including type of therapy [...], type of outcome measure, time of measurement of outcome (post-therapy or follow-up), type of problem treated, therapeutic approach, and communication modality,
  among others. A comparison between face-to-face and Internet intervention
  as reported on in 14 of the studies revealed no differences in
  effectiveness.


In short, the studies reviewed,


  provide strong support for the adoption of online psychological
  interventions as a legitimate therapeutic activity [...].