Google algorithm changes? Freshness helps more

I've seen some big changes in Google in the past 48 hours. Some of my websites, a couple of which were top 3 in the SERPS have now falling back to 6th and 7th. Some changes across the board - I feel this change might be related to freshness of the content perhaps.

I have reduced my posting from 2-3 posts a day down to around 1 and I think this may be a contributing factor.

I also think that backlinks from Blogger and free hosting domains have been reduced in terms of authority - so we're seeing sites built with this in the backend start to look like a house of cards.

What have you been seeing in the latest Google search results? Any changes to your rank? Do you think there is a new algorithm in place?