Here We Go!!
OK so the internet went nuts this morning, everyone's sharing Mario's newly discovered LinkedIn account. Indeed Mario is on LinkedIn, but also it looks like he's not. What we mean to say is that there is a Mario Bros LinkedIn account but it doesn't appear to be official, if you follow their profile's link back to their Twitter account you can see that due to the lack of the blue check mark next to their name that they are not verified, Nintendo themselves are verified so having a Mario bros account that isn't would be silly of them. Upon viewing their tweets I can confirm this LinkedIn account is fan made, sharing things the official Super Mario Facebook page would never share, including fake Mario bros mugshot drawings. Still, they really tried to make the account look real and it did get a lot of attention.
Source (S) Source 1, Source 2