corporate use of social media

when I think of social networks  I think of facebook and twitter, youtube many corporate companys uses social media and networking because it makes more efficent of how they run business and easier to get the word out on there advertising  , today im gonna be using nokia as a  an example nokia is known for its mobile phone technology  http://conversations.nokia.com/ nokia uses twitter and facebook to get there advertising out and nokia forums blogs http://conversations.nokia.com/2010/10/13/poll-results-how-do-you-use-ovi-maps/ also has a recent poll which answers needs of the customers if they ,have any questions about there nokia mobile phone . Nokia uses youtube for latest designers and chatting to them on youtube vblogging ,emailing latest products to inbox   pitfalls for email is customers have a spam filter so the spam filter adds it to junk and adverts are hardly read,corporate business may get bad publicity on blogging if something was posted up and was spread out to customers.