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Google search stats:

1,000,000,000,000 (one trillion) – approximate number of unique URLs in Google’s index (source)
2,000,000,000 (two billion) – very rough number of Google searches daily (source)
$110,000,000 – approximately amount of money lost by Google annually due to the «I’m Feeling Lucky» button (source)
24,400 – number of people employed by Google (December, 2008)
68,000,000 – the average number of times people Googled the word Google each month for the last year (source: keyword tool)
$39.96 – the average cost per click for the phrase «consolidation of school loans» in AdWords (source: keyword tool)
1,430,000 – the number of Google results for «Robert Scoble»
136,000 – the number of Google results for «Admiral Ackbar»

Wikipedia stats

YouTube stats

70,000,000 – number of total videos on YouTube (March 2008)
200,000 – number of video publishers on YouTube (March 2008)
100,000,000 – number of YouTube videos viewed per day (this stat from 2006 is the most recent I could locate)
112,486,327 – number of views the most viewed video on YouTube has (January, 2009)
2 minutes 46.17 seconds – average length of video
412.3 years – length in time it would take to view all content on YouTube (March 2008)
26.57 – average age of uploader
13 hours – amount of video are uploaded to YouTube every minute
US $1.65 billion in Google stock – amount Google Inc. announced that it had acquired YouTube for in October 2006
$1,000,000 – YouTube’s estimated bandwidth costs per day

(sources here, here and here)

Blogosphere stats

133,000,000 – number of blogs indexed by Technorati since 2002
346,000,000 – number of people globally who read blogs (comScore March 2008)
900,000 – average number of blog posts in a 24 hour period
1,750,000 – number of RSS subscribers to TechCrunch, the most popular Technology blog (January 2009)
77% – percentage of active Internet users who read blogs
55% – percentage of the blogosphere that drinks more than 2 cups of coffee per day (source)
81 – number of languages represented in the blogosphere
59% – percentage of bloggers who have been blogging for at least 2 years

Twitter stats

1,111,991,000 – number of Tweets to date (see an up to the minute count here)
3,000,000 – number of Tweets/day(March 2008) (from TechCrunch)
165,414 – number of followers of the most popular Twitter user (@BarackObama) – but he’s not active
86,078 – number of followers of the most active Twitter user (@kevinrose)
63% – percentage of Twitter users that are male (from Time)

Ich hätte mal gern die gesamte Zahl der Twitter-Nutzer gewusst… hat die jemand…?

Facebook stats

150,000,000 – number of active users
170 – number of countries/territories that use Facebook
35 – number of different languages used on Facebook
2,600,000,000 – number of minutes global users in aggregate spend on Facebook daily
100 – number of friends the average user has
700,000,000 – number of photos added to Facebook monthly
52,000 – number of applications currently available on Facebook
140 – number of new applications added per day

Digg stats

236,000,000 – number of visitors attracted annually by 2008 (according to a Compete survey)
56% – percentage of Digg’s frontpage content allegedly controlled by top 100 users
124,340 – number of stories MrBabyMan, the number one user, has Dugg (see updated number here)
612 – number of stories from Cracked.com that have made page 1 of Digg (see all 41 pages of them here)
36,925 – number of Diggs the most popular story in the last 365 days has received (see story here)

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