As outlined in my interview with Angela Slatter, http://downunderwonderings.blogspot.com/2010/08/angela-slatter-australian-short-story.html, the publishing world is quite small and the last thing you want to do is put your wrong foot forward.
Controversy can help people get traffic their way, but make sure it’s not controversy that will kill your publishing dream.
Part of the problem is it is so easy to misunderstand intent online. There is no body language, tone or emotions that help us decode messages.
In the same way, be careful about how you interact with industry professionals on these sites. The last thing you want is to be branded a stalker or gain a poor reputation amongst agents and publishers.
Here are some helpful sites to guide you through social networking for writers:
http://helpineedapublisher.blogspot.com/2010/08/twitter-for-authors-part-3-tweeting-in.html
http://www.articlesbase.com/networking-articles/4-rules-to-successful-social-networking-2086318.html
http://bookmarketingmaven.typepad.com/savvy_book_marketer/successful-social-marketing.html
http://www.associatedcontent.com/article/426195/social_network_for_writers.html