engagement?

what the hell does 'engagement' mean?

http://www.kaushik.net/avinash/2007/10/engagement-is-not-a-metric-its-an-excuse.html


1. why does website exist?

2. define 3 or less metrics to measure success (accomplish purpose)

3. revenue/conversion; engagement - how to measure?

4. don't call that metric 'engagement'

ideas....
1. are you engaged with us?
2. would you recommend site to friends?
3. primary market research
4. customer retention over time
5. recency of unique visitors (last resort)

6. fraction of multi-visit visitors (> 1 visit)
do visitors search the site?
do they 'save' stuff?
do they sign up for email?
how many entries to home page?