There was an idea - why not enter the category “Participating in ...” in Habraprofile, where you could list which other network communities / social networks Habrowser is in (for now, you can only specify your LiveJournal address in the settings). Even better, if you can just choose from the list - for example, Recommendations already have “Social Networks”.
Taking into account the trend of converging personal data into one mega-profile, as well as OpenID - it would be convenient to have one pass-through account or at least move in this direction.