News feed database design as in Facebook

Question

How would make a news feed \"friendly\" database design, so that it wouldn\'t be extremely expensive to get all of the items (query) to put in the news feed? The only way I can

Answer 1

It's hard to answer this question without a schema, but my hunch is that a UNION involving 10 or more properly indexed tables is nothing:
A typical LAMP application like wordpress or PHPBB runs more than 10 queries per pageview without problems. So don't worry.