It is now some years ago (circa 2006) that I first saw the above graphic by JISC (and was recently reminded of it by 'Coach Carol'). BTW - better to load the original which has some useful links. At the time it first looked exciting, but on closer examination it painted the scenario of Susie having to change her ePortfolio as she moved from one institution to another.
This impractical solution was not in line with my thinking, whereby the learner would have to rebuild their ePortfolio upon each transition. See second paragraph of my article Interoperability and Leap2A. Even at that time (some 6 years ago!) I was convinced that the only realistic solution for any user would have to be that of owning the one ePortfolio for life, and that it would therefore have to be externally hosted as is eFolio.
Unfortunately some six years later litttle progress has been made. Most ePortfolio systems are still very much institutionalised or designed for one sort of assessment and some still insist on performing as a content delivery system owned by the institution. As long as institutions continue to misappropriate the ePortfolio concept it is no wonder that learners are resorting to blogs and collaborative tools such as Facebook or Bebo.
Readers of this blog would do well to contact me in order to understand more of the advantages of eFolio