If you were on Twitter.com earlier you may have picked up on a few design issues. It was only temporary but like many other things on twitter, it caused a bit of a stir.
Twitter’s product designer Vitor Lourenço said no design changes were taking place, but clearly some have, even if it is just a change to a more mac like setting navigation.
You should see the changes in your settings here, if not, here a few screenshots till you do.
Before
After:
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