1. looking unprofessional - bikini photos don't belong on facebook anyway
2. being intrusive - sending unwanted information
3. breach of trust - you can't share client names in a blog etc.

These are all good points that should provide guiding values in crafting your marketing strategy - they should not prevent you from action. People still do business with those that they know, like and trust.

Many professionals actually avoid facebook - especially when privacy may be an issue. This does NOT preclude marketing online. There is a plethora of options available.

Your website - share news, alerts, checklists and worksheets

Your blog - case studies that do not identify the client can show your passion and expertise

Twitter - what you Tweet is what you are passionate about - community involvement, wowing a client, great employees

LinkedIN - connect with other professionals. As this is a B2B network it is a naturally starting point. Nurture your connections to your referral network by sharing business news, commenting on their status updates and referring those you highly respect.