petulantprodigicalpaladin said: Not only would it be really uncomfortable for me, but it could also tread along some grounds on law. In example, Twitter may have the right to sue Tumblr if a twitter-esque design is being used on it without permission.
Uncomfortable just because it's a change or is there actually something really uncomfortable for you concerning the design? Because I really don't like it when people say that something's uncomfortable, just because it's a change. I can understand it, but I don't really like it that people look down on it, just because omg no they are being dragged out of their comfort-zone when it actually serves for a better purpose.
And Twitter isn't alone with that. As far as I see, it would also be similar to Facebook. I don't really know Twitter, therefore can't judge how much similarity it holds, but I highly doubt that something like that will happen.