Congratulations to Twitter for managing to put the "ad" label into the least visible spot I've seen yet. Took me 20 seconds to find it.
@Techaltar clickrate must be optimal 👌
I've been working in a company who decided at some point that every modification must be "rational", surprisingly we discovered that the less the "ad" mention is visible, the more clics we got 😱 That's the point where I left, similarly to Twitter we were on a race trying to be profitable.

