Everybody now seems to be either on Facebook or Twitter (or both). Oracle Corporation is
fully using web 2.0 technologies and social networks (they are on twitter and Faebook. This is not really surprising as this company has almost always been riding the waves of emerging technologies. See for example the usage of Social Networks and 2.0 technologies in Oracle’s CRM offering.

However, I wonder about the dangers of social networks when used (and abused) by poorly informed people.
Social engineering is also part of a hacker’s bag. Tools like Maltego allow you to search on multiple social networks and display this information in a graphical way.

Here’s a very good post on Twitter and information mining, by Lenny Zeltser.