“Black is a girl's best friend.”

Source: Faefever

Source: Pretty Little Liars

Quoted in The London Review of Books http://www.lrb.co.uk/v22/n01/hasl02_.html (6 January 2000)

Variant: In life, there are only four kinds of girls:
The girl who played with fire.
The girl who opened Pandora's Box.
The girl who gave Adam the apple.
And the girl whose best friend stole her boyfriend.
Source: The Carrie Diaries

Source: Fang

As quoted in "Seattle Seahawks' Richard Sherman addresses 'Black Lives Matter' after post falsely attributed to him" http://blog.seattlepi.com/football/2015/09/16/seattle-seahawks-richard-sherman-addresses-black-lives-matter-after-post-falsely-attributed-to-him/ (16 September 2015), by Stephen Cohen, Seattle Post-Intelligencer, Hearst Seattle Media
Press conference (16 September 2015)

Bang Showbiz, December 2007

This has been widely attributed to Franklin since the 1940s, but is not found in any of his works. The language is not Franklin's, nor that of his time. It does paraphrase a portion of something he wrote in 1732 under the name Alice Addertongue:
If I have never heard Ill of some Person, I always impute it to defective Intelligence; for there are none without their Faults, no, not one. If she be a Woman, I take the first Opportunity to let all her Acquaintance know I have heard that one of the handsomest or best Men in Town has said something in Praise either of her Beauty, her Wit, her Virtue, or her good Management. If you know any thing of Humane Nature, you perceive that this naturally introduces a Conversation turning upon all her Failings, past, present, and to come.
Misattributed