I only use Twitter, and I only follow interesting or noteworthy people in my specific industry. I've been exposed to interesting techniques and papers, made valuable connections, and found paid jobs. However, I have also felt distracted and distressed by the significant amount of [men vs women, black vs white, gay vs straight, cis vs trans] bickering and put-downs coming from even these people, because apparently that's what you do on Twitter. It's a trade-off, but I cannot call this healthy.