While it can be negative experience first few times it happens, the other dangerous side is that it's instantaneously addictive (we people crave attention). And addiction is what everyone in sales and marketing wants, as long as it's still legal. An addict is an ideal consumer.
I terminated my Twitter account about 2 years ago, after I found out that I spent huge amounts of time and psychical energy there. I generated two random UUIDs, used the first one to create one of those one-time emails, and the second to be the new password. I changed my Twitter password and email, and promptly rebooted my computer without storing these UUIDs anywhere.
It worked. Going cold turkey was incredibly hard. I wrote to Twitter support a few times so they could restore my account, but they couldn't establish my identity (just as planned!) Then, after a few months, cravings started to diminish.
Now, instead of being Twitter addict, I became Facebook and HN addict. Sigh. I can repeat my trick, but now I lack the willpower to do that. RescueTime tells me that I spend 3-4 hours every day on Facebook and HN.
Time to generate more UUIDs.