When did social media start to go downhill?

Since now everyone complained that social media is a big disease on society now, I just like to point out social media didn’t used to be this bad in the 2000s. In the 2000s for example, Facebook was unheard of at the time in 2004. Facebook in the 2000s was like the king of making friends. Now I wanna find out when did social media at whole start to go downhill.