"me" rel value which is used to indicate profile equivalence and for identity-consolidation, was introduced by XFN 1.1. rel="me" is used on hyperlinks from one page about a person to other pages about that same person.
For example, Tantek's home page has (markup simplified)
And his Twitter profile itself has (markup simplified)
Thus establishing a bi-directional rel-me link and confirming that the two URLs represent the same person.
you can use the XFN creator form to create rel-me hyperlinks.