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Some of these numbers may simply be mind-boggling, but thats how the world of the internet is – growing as you read this piece.

E-mail
90 trillion – The number of e-mails sent on the Internet in 2009
247 billion – Average number of e-mail messages per day
1.4 billion – The number of e-mail users worldwide
100 million – New e-mail users since the year before
81% – The percentage of e-mails that were spam
92% – Peak spam levels late in the year
24% – Increase in spam since last year
200 billion – The number of spam e-mails per day (assuming 81% are spam)

Web sites
234 million – The number of Web sites as of December 2009
47 million – Added websites in 2009

Domain names
81.8 million – .COM domain names at the end of 2009
12.3 million – .NET domain names at the end of 2009
7.8 million – .ORG domain names at the end of 2009
76.3 million – The number of country code top-level domains (e.g. .CN, .UK, .DE, etc.)
187 million – The number of domain names across all top-level domains (October 2009)
8% – The increase in domain names since the year before

Internet users
1.73 billion – Internet users worldwide (September 2009)
18% – Increase in Internet users since the previous year
738,257,230 – Internet users in Asia
418,029,796 – Internet users in Europe
252,908,000 – Internet users in North America
179,031,479 – Internet users in Latin America / Caribbean
67,371,700 – Internet users in Africa
57,425,046 – Internet users in the Middle East
20,970,490 – Internet users in Oceania / Australia

Social media
126 million – The number of blogs on the Internet (as tracked by BlogPulse)
84% – Percent of social network sites with more women than men
27.3 million – Number of tweets on Twitter per day (November, 2009)
57% – Percentage of Twitter’s user base located in the United States
4.25 million – People following @aplusk (Ashton Kutcher, Twitter’s most followed user)
350 million – People on Facebook
50% – Percentage of Facebook users that log in every day
500,000 – The number of active Facebook applications

Images
4 billion – Photos hosted by Flickr (October 2009)
2.5 billion – Photos uploaded each month to Facebook
30 billion – At the current rate, the number of photos uploaded to Facebook per year

Videos
1 billion – The total number of videos YouTube serves in one day
12.2 billion – Videos viewed per month on YouTube in the US (November 2009)
924 million – Videos viewed per month on Hulu in the US (November 2009)
182 – The number of online videos the average Internet user watches in a month (USA)
82% – Percentage of Internet users that view videos online (USA)
39.4% – YouTube online video market share (USA)
81.9% – Percentage of embedded videos on blogs that are YouTube videos

Malicious software
148,000 – New zombie computers created per day (used in botnets for sending spam, etc)
2.6 million – Amount of malicious code threats at the start of 2009 (viruses, trojans, etc)
921,143 – The number of new malicious code signatures added by Symantec in Q4 2009.

Data sources: Website and web server stats from Netcraft. Domain name stats from Verisign and Webhosting.info. Internet user stats from Internet World Stats. Web browser stats from Net Applications. Email stats from Radicati Group. Spam stats from McAfee. Malware stats from Symantec (and here) and McAfee. Online video stats from Comscore, Sysomos and YouTube. Photo stats from Flickr and Facebook. Social media stats from BlogPulse, Pingdom (here and here), Twittercounter, Facebook and GigaOm.