(April 2017: This page represents my attitudes to various social media as at May 2010. Consider it substantially obsolete today. Many of the platforms have altered or disappeared, new ones have come along, and my reluctance over Facebook has been replaced by new reluctances over Facebook. An updated page will be posted "in due course". - RE, 21.4.17)
The proliferation of social networking sites is a subject that makes my brain want to explode. Myspace makes me cringe, for two reasons: (i) the encourages some really bad, lazy web layout; and (ii) it's now owned by Rupert Murdoch. Facebook has achieved flavour of the month status, and thanks to peer pressure I've beefed up my presence there.