This is what Twitter looks like when their image server don’t work. Their images are stored on amazon big boys I believe, here: http://s3.amazonaws.com/twitter_production/profile_images/ (that won’t work by the way).
It’s interesting to note that this is one of the reasons why your Twitter profile ranks so well in Google, oh you never checked? You should.
What you see here is what Google would see, instead of images they would see the text profile names, just as you see here, typically used as an “alt tag” AND “title tag”.
There you go.
Some people I know have protected their updates due to their Twitter page out-ranking their blog or whatever domain they wish page.
You had that issue?