Adele's mobile app has been downloaded 1.5m times

"Adele is closing in on 20m sales of her album 21, but the British singer has also been a big hit on Apple and Google's app stores.
The official Adele app has been downloaded more than 1.5m times on iPhone and Android, according to David Emery, head of marketing at Beggars Group, the parent company of Adele's label XL Recordings.
[...]
In terms of features, Adele's app is fairly standard – news, photos, videos, song previews and tour dates, as well as a social section for comments and photo postings.
Emery says the aim was less about selling more music and tickets, than to provide "another communication platform" for Adele's fans, sitting alongside her own website, Facebook and Twitter."

Source:  The Guardian, 7th March 2012

Lady Gaga has 20m followers on Twitter

She's the first user to reach 20m.

Retrieved 6th March 2012

David Beckham's H&M Super Bowl ad had 109,000 comments in social media within 45 minutes of airing

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Source:  Data from Bluefin, reported by AdAge, 6th February 2012
Note - The count is for comments made within 45 minutes of the ad airing

"Several hundred" YouTube partners made more than $100,000 in 2011

"A Google spokeswoman says that "several hundred" of its partners made more than $100,000 in 2011, up 80% from the "couple of hundred" partners who made more than that in 2010. YouTube partners have also increased to 30,000 in 2011 from 20,000 in 2010, says Tom Pickett, YouTube's global director of content, operations and online creators."

Source:  Wall Street Journal, 2nd February 2012

One of Justin Bieber's Tweets in January 2012 had over 92,000 ReTweets

"On the 10th of January, 2012, Justin Bieber retweeted one of Floyd Mayweather’s tweets (@FloydMayweather Manny Pacquiao I'm calling you out let's fight May 5th and give the world what they want to see). This tweet went on to receive 92,314 Retweets! Now that’s evidence of the Bieber-bump in action."

Source:  Blog post by TwitSprout, 1st February 2012

Follow the link for data on retweets for the top 10 most-followed

The most talked about celebrities on Sina Weibo in China

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Source:  Press release from CIC, 14th December 2011
Note - Sina Weibo is China's biggest micro-blogging platform - 'China's Twitter' (if you must)

The Top 10 global topics on Facebook 2011

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Source:  Data from Facebook, published 7th December 2011
Note - clearly it's not for the whole of 2011 - just to the start of December

The Top 10 Trending Topics on Twitter in 2011

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Source:  Data from HootSuite, published by AdAge, 6th December 2011
Note - the dates for the analysis are 30th November 2010 - 1st December 2011
Plus - Twitter's official 'Hot Topics' although they're not saying how they compiled the list, so I suspect some editing may have gone on.

The top 20 most-followed people on Google+

Rank, name, followers
"#1 Britney Spears 807,743
#2 Larry Page 780,994
#3 Snoop Dogg 681,127
#4 Mark Zuckerberg 612,321
#5 Tyra Banks 571,843
#6 Paris Hilton 525,609
#7 Richard Branson 515,344
#8 Jessi June 512,775
#9 Sergey Brin 502,636
#10 Vic Gundotra 495,516
#11 Tom Anderson 482,796
#12 Dane Cook 473,356
#13 will.i.am 432,883
#14 Trey Ratcliff 403,858
#15 Thomas Hawk 399,687
#16 Felicia Day 388,210
#17 Dalai Lama 378,951
#18 Hugh Jackman 374,329
#19 Guy Kawasaki 368,127
#20 Ron Garan 366,370"
Source:  SocialStatisics.com, retrieved 1st December 2011
Notes:
Jesse June is a glamour model (!)
Vic Gundotra is a techie at Google
Trey Radcliff & Thomas Cook are both photo bloggers
Dane Cook is a comedian & actor
Felicia Day is an actress
Ron Garan is a NASA Astronaut
Tom Anderson is 'Tom from MySpace'
Mark Zuckerberg has seemingly never added anything - people just think it's amusing to add him
Compare to the Twitter top 10 - 7 of those are women, only 4 of the G+ top 10 are; Britney Spears is the only person to appear on both lists.  The other striking things are that it's still comparatively 'techie' and photography is popular.

A Tweet from Selena Gomez generated 20,000 downloads of the Postcard on the Run mobile app

"Selena Gomez, the 19 year-old pop princess, actress and girlfriend of Justin Bieber, tweeted the above approbation for the iPhone application to her 8.3 million followers two weeks ago. Today, she informed the world that she too can play the celebrity investor and advisor part, and participated in Postcard on the Run’s $750,000 round of financing.
Postcard on the Run is a fresh, Los Angeles-based startup with iPhone and Android applications that lets you send real postcards to friends anywhere the world for $0.99 a piece. It has a few hooks including automatic address retrieval and “smell mail,” a feature that lets users add scratch-and-sniff scents to postcards.
The startup, which competes directly with Postagram and Apple’s similarly-purposed Cards app, now has Gomez, a powerful social media socialite — and possibly her even more influential boyfriend by association — in its corner. In addition to her Twitter legions, Gomez has nearly 25 million fans on Facebook. A Facebook update on today’s news nabbed 4,117 likes and 663 comments in four hours. Score one for Postcard on the Run.
The story goes that Gomez found the iPhone application on her own and loved it so much she tracked down founder Josh Brooks in September. The pair continued to chat and talks quickly turned to investment opportunities, Brooks told VentureBeat.
“She’s a fantastic partner for me,” Brooks said. Case in point: A recent tweet from Gomez netted the startup 20,000 downloads in 24 hours, he said."

Source:  VentureBeat, 17th November 2011

The American X Factor gets an average of 94,000 comments in social media per episode

"Fox's "The X Factor" is No. 1 among new series, with an average of 94,000 social comments per episode as recorded by Bluefin. It hasn't been the "American Idol"-killer that Simon Cowell obviously hoped it would be, but it's turned out to be a very solid hit for Fox. In fact, it's helping boost other shows on the network."

Source:  Data from Bluefin, reported by AdAge, 4th November 2011

Note - in the article 5 shows are compared, but frustratingly there's no direct comparison between X Factor and American Idol

7 of the 10 most followed people on Twitter are women

"# Name (Screen Name) Followers
1. Lady Gaga (ladygaga) 15,117,972
2. Justin Bieber (justinbieber) 13,868,314
3. Katy Perry (katyperry) 11,511,972
4. Barack Obama (BarackObama) 10,872,247
5. Kim Kardashian (KimKardashian) 10,735,244
6. Britney Spears (britneyspears) 10,662,045
7. Shakira (shakira) 9,802,132
8. Rihanna (rihanna) 9,055,660
9. taylorswift13 (taylorswift13) 8,759,295
10. ashton kutcher (aplusk) 8,028,802"
Source:  Retrieved from Twitaholic, 31st October 2011