Well what I'd say is if you have 30 seconds and you happen to be on Facebook anyway, you can quickly comment on our page.
If you have more time and want to read more in depth discussion then you'd come onto the forum.
And obviously our news stories, feature galleries, techniques, reviews etc are all on the site, not Facebook, which is just a means of communicating that new stories have been published.
We run lots of competitions both on here and on Facebook. The competitions on Facebook are usually very small prizes of low value, compared to the prizes we've given away on here which have included DSLRs and lenses.
At the moment we're running a special Christmas giveaway, open to everyone here:
http://www.photoradar.com/news/story...2010-giveaways
Let me know if you have any more questions,
Amy