I really hate how Twitter notifies me of what other people like or RT. If many people RT something then sure I'll catch it on my TL. 
I've disabled all of those, but yeah, I suppose they are worried you don't log in enough. 
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Facebook's worse. It's needy. I haven't even looked at Facebook in 2 years and it seems like the longer I ignore it, the more emails it likes to send me. "Hey, look at what [so-and-so] posted! [What's-his-face] said this! [What's-her-name] made a video!"
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I definitely have everything from Facebook disabled. What's really interesting is I was at some point in a special class of users because of how much I used it. I would get these obviously "elite user" targeted emails.
End of conversation
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