I follow a lot of celebrities, sportsmen, journalists on Twitter. I always notice which Twitter client they are using. A vast majority of them use Twitter for iPhone, Echofon, and a lot of them also use Twitter for Blackberry. Surprisingly, given Android's marketshare, not too many seem to use Android devices.
However, I am yet to see a famous person using Windows Phone devices. All Windows Phone users seem to be either Microsoft enthusiasts, geeky people, or teenage girls. Do you know of any well-known people who uses Windows Phone?
Ryan Seacrest uses one. I follow a couple of WP7 related stuff on Twitter and saw that Ryan Seacrest retweeted something from Windowsphones. I believe I saw or read something about Dane Cook using a WP7 as well.
Do fictional famous people count? Richard Castle of "Castle" uses a WP7, last I saw.
I LOVE that show however they have iPhones all over that set. Castles partner used to rock a Palm Pre Plus now shes totting an iPhone. I forgive them for this because that show makes up for it in humor and fun.
I think there's a difference between product placement and celebrities using WP7 in their personal lives. Say what you will about BlackBerry (and there's PLENTY to say!), they have a wide following in the rich and famous set. They have a weekly roundup of "Celebrity BlackBerry Sightings" that do not generally include product placement at APCentral's sister site, Crackberry.com.
wasn't there a lady(can't remember her name) that had WP7 in her MTV earlier this year? and I believe she praised it too, oh and I believe there was a sports(football I think) star that was using it... and again I can't remember his name... me and celebrity names don't mix very well...
Image info from a TwitPic by @BillGates shortly after WP7 was released revealed the device to be Samsung SGH-I917, which would be a Focus. Of course, that was a year ago.
