Christie welcomes Biden to Instagram with a #tbt

New Jersey Gov. Chris Christie (R) on Thursday welcomed Vice President Biden to Instagram with an old photo of them together.

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Biden joined the social media network a day earlier, and first shared a picture that displayed his classic aviator sunglasses. Biden's second picture was a selfie of him with President Obama.

"#tbts always trump #selfies. Welcome to Instagram@VP! #tbt @udbluehens," Christie wrote on Instagram.

#tbt is short for "throwback Thursday," in which people share old photos through social media every Thursday.

Christie also tagged the University of Delaware, which is both his and Biden’s alma mater.

Both are considered potential 2016 presidential contenders.