So recently, Tumblr started putting ads on people's actual blogs - which has generally been regarded as a bad idea and made a lot of people angry (with apologies to Douglas Adams).
Frankly though, this is proof that Tumblr's ad staff currently doesn't fucking understand marketing at all or their userbase. If you're going to instigate a radical change like ads on actual personal blogs you: A) Ensure it actually works right before you do; otherwise you end up with shit like the broken audio ads on the dash that were loud and annoying and looped nonstop (and in this case the on-blog ads still didn't work as they broke a huge number of custom themes). And B) You at least make an announcement that you're making such a change, so people are prepared and can expect/come to accept said change (even if grudgingly), rather than just forcing it on people.
Even so, the amount of entitlement these little shits have that they think they deserve to profit off the ads that the site is trying to use to keep afloat (a site they get to use FOR FREE I MIGHT ADD), like their special snowflake ranting bullshit and fanshit is of value to anyone other than themselves, is just
astounding.