Stealing this idea brazenly and wholesale from @utotranslucence, to get to know people better:
Hi there!
Who are you?
Why did you follow me?
What kinds of things do you care about?
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Ribbonfarm reader -> commenter -> tweet replier
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That is probably the standard discovery api for me.
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Hmm in general remembering how I encountered someone online is the exception. Not remembering is the default.