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What's a Factoid? - OurCards
A factoid is an interesting yet brief fact related to the person displayed on the card. Think of the factoid as an interesting tidbit you’d like to share with others.

They could include:

Remember, factoids are optional and you won’t have one for every card. Space is limited so keep the text brief. Consider entries that are unique to the person on the card and ones that will make the reader think, “Hmmm, I didn’t know THAT about her!”