2011 in Internet and Web statistics, a round-up by Pingdom. Some numbers that caught my eye…

* $44.25 – The estimated return on $1 invested in [permission] email marketing in 2011.

* 555 million – Number of websites (December 2011).

* 70 million – Total number of WordPress blogs by the end of 2011.

* 2.1 billion – Internet users worldwide. [of which only 100 million were active Twitter users in 2011]

* 51 million – Total number of registered users on Flickr.

Many more global stats at Pingdom.

And here’s some UK Internet statistics I’ve tracked down myself just now…

* £68 billion – spent by UK online shoppers spent in 2011 [likely to rise to over £80bn in 2012].

* £1 in every £8 spent on UK retail is now spent online.

* 13 million hours – spent by UK shoppers finding, choosing and ordering stuff online.

* 61% of UK internet users do not want to engage with brands on social networks.

* 30 million unique users on Facebook in the UK.

* two in five (41 per cent) of the UK online population claim to be getting bored of social media.

* 1.3 million eBook Readers and Tablet PCs were gifted in the UK in December 2011, with Kindles at 92% of the market share.

* 6.8 million iOS and Android devices were activated on Christmas Day 2011 in the UK.

* 82% of the UK adult population was an Internet user of some kind, by the final quarter of 2011.

* 850,000 UK children have no Internet access at home

* 8.4m Britons have never used the Web