"Just a reminder that if you haven't already done so, please send me a picture of you and your guest by end of business tomorrow. Warning: If you do not submit a picture, (names) have threatened to comb the internet for the 'perfect' picture of you or someone who sort of looks like you!"
Social media does increase the potential to threaten better, and unfortunately, to follow-through too. My picture sent in less than a minute in response to this.
