So.cl sends email when you got a like, when somebody likes post you've liked, when somebody comments on your post, when somebody comments in posts you've liked.
So.cl should start using more the notification section and stop sending email for everything ;).
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It's a good idea. We started with email notifications as the system was small, it worked pretty well.
As we've added a lot of new people though the email volume is getting high. For the short term: in the upper right corner there are settings. You can select your email notification settings there.
For the longer term we're working on turning down the email volume.