My favorite offender: Twitter. On the front page, sign-up is the first, optically more pronounced option with a blue button, while log-in is a considerably light-weighted runner up with a white button. (Which makes sense, since practically no one visiting this obscure service ever considered to create an account. At least, this must be the way of thinking behind this.*) However, when interacting with the site while not logged-in already, it's the other way round, now log-in ist the more prominent blue button and sign-up the white runner-up.
Short version: users are not allowed to learn the ways of the interface, but have to ready themselves to encounter the unknown on every step.
*) This is by far not unique. E.g., Google Adsense makes you search for ways to enter the site, if you are not totally new to the platform. Best practice is apparently to never let pass an opportunity to punish recurring customers. /s
My favorite offender: Twitter. On the front page, sign-up is the first, optically more pronounced option with a blue button, while log-in is a considerably light-weighted runner up with a white button. (Which makes sense, since practically no one visiting this obscure service ever considered to create an account. At least, this must be the way of thinking behind this.*) However, when interacting with the site while not logged-in already, it's the other way round, now log-in ist the more prominent blue button and sign-up the white runner-up.
Short version: users are not allowed to learn the ways of the interface, but have to ready themselves to encounter the unknown on every step.
*) This is by far not unique. E.g., Google Adsense makes you search for ways to enter the site, if you are not totally new to the platform. Best practice is apparently to never let pass an opportunity to punish recurring customers. /s