anallawalla - 3:41 am on Apr 29, 2011 (gmt 0)
Some people might check FB just once a week or less frequently. I don't check it daily. If they don't have a lot of friends or pages to follow, they might see an old news item and decide to leave.
Some people might not realise that liking a page makes them a permanent fan until they unlike the page. The answers will vary depending on the demographics.