|Sans Serif||PT Sans|
|Serif||Gentium Book Plus|
Many sans serif fonts fail to distinguish between uppercase I and lowercase l. Twitter's new font is an example of this.
On top of that, Twitter started dishing out blue ticks on subscriptions.
These two features combine to form deceptive Twitter usernames, as demonstratedin this tweet by Adrian Roselli.
PT Sans passes this AppleTVPlus test.
But some famous fonts like Helvetica and Roboto fail at it.