One of my portraitspic.twitter.com/URmDspcwnH
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
簡単に作れます。
あんまり作る人いないなあ。グラフィックスソフトがあればできます。持っていない人が多いのかな。
Interesting ! Do you know the name of this kind of phenomenon ? :)
I am sorry I do not know the name.
Wow so simple! I was thinking how to reproduce it and was thinking of peturbing the spatiotemporal contrast sensitivity function somehow using edge detected images but this way is waaay simpler!
Scroll up or down slowly and it reveals itself. Bam!
Nicely done... at first I thought it was Mr. Rogers.
Then in the second screen your face became clearer. 
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.