What is the correct etiquette when someone RTs you on Twitter? (poll 1736489)

What is the correct etiquette when someone RTs you on Twitter?

@ them a "Thank you"

DM them a "Thank you"

RT their tweet adding a "Thank you"

Try to find a tweet of their's to RT in return

Ignore them and simply bask in the (possibly transient) glow of your popularity

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See this poll on: https://poll.fm/1736489/embed