Orkut is a social netowk and it has a major problem although not a bug - when you speak to someone over the internet you don't really know who he is. It can be problematic if you:
- want to do business with this person
- you want to meet him in real life (as in a date)
who knows who this person is and what stands behind is "nice" presence.
that why i use public records search (only for US guys, sorry! if there's a similar thing for India please do let me know and I will public it here).
Another superb tool is OnlineReverseTrace.info allowing you track back people via their Email addresses or their phone number. This is the best tool for online harassment.