sutips - 1:52 am on Oct 10, 2010 (gmt 0)
The common thread between SEO and SEM is the chase of numbers.
SEO is after bigger traffic to a site
SEM is after the most number of followers/fans
And both are not effective if it's not about engagement.
For SEO, you'd want targeted traffic who'll respond to your offers and improve conversion.
For SEM, it's about engaging with your followers/fans. Not just someone who'll follow you, but who will really interact with you - click on the links you post, answer when you post a question, retweet your post, like or share your FB page status update.
But even with SEM, many are caught up with the chase of the most numbers.