Have you noticed that some profile pics on Twitter are now square instead of round?
The change is part of the new Twitter Blue for Business, which is rolling out now. The first change you'll notice is that brands and businesses now have a square profile pic instead of a round one. This includes Twitter itself, Apple, Microsoft, and Mashable, for example.
Also, businesses that have signed up for Twitter Blue for Business now get a gold checkmark. And finally, companies can now give...