Probably kids.
If you get sick of 'em, try a few "stop that!s. If it carries on, eventually you'll have to drop 'em.
The key point is :
Don't drop 'em when they're online!
That is VERY bad manners
They probably won't notice you are missing from their friends list.
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Oh mother, don't be so sentimental, things explode every day.
In Test, nobody can hear you scream.