Some were confused, others were eager to learn. And if you’re Warren Buffett, all you had to do was announce your arrival – even if you were seven years late to the party.

Here’s how 11 CEOs entered the Twitterverse:

Berkshire Hathaway CEO Warren Buffett has (finally) arrived.

Warren is in the house.

— Warren Buffett (@WarrenBuffett) May 2, 2013

And Uber CEO Travis Kalanick had the same idea.

What's up…tbone in the house!!

— travis kalanick (@travisk) October 27, 2007

Intel CEO Brian Krzanich just wanted to tell someone named Josh that he had joined Twitter.

Hi Josh
I am now on twitter

— Brian Krzanich (@bkrunner) February 11, 2011

Others were slightly confused. We’re not sure what eBay CEO John Donahoe was approving with his first tweet.

https://twitter.com/Donahoe_John/status/9376731137

Airbnb CEO Brian Chesky literally had nothing to say.

nothing

— Brian Chesky (@bchesky) January 31, 2008

Yahoo CEO Marissa Mayer was a little more eloquent.

Discovered the American Visionary Arts Museum in Baltimore — extremely cool in terms of art and its philosophies (http://www.avam.org/)

— marissamayer (@marissamayer) July 21, 2009

And Tesla CEO Elon Musk had to clarify some things before he started tweeting.

Please ignore prior tweets, as that was someone pretending to be me :) This is actually me.

— Elon Musk (@elonmusk) June 4, 2010

We also learned a few things. For example, T-Mobile CEO John Legere hearts New York.

First day on twitter.. In NYC today.. Ran in Central Park..100 degrees! I love NYC

— John Legere (@JohnLegere) July 6, 2013

So does Live Nation CEO Michael Rapino.

Just back from NY- Nickleback… good 2b home

— Michael Rapino (@Michael_Rapino) March 8, 2009

Thanks to Twitter, we now know exactly what Hootsuite CEO Ryan Holmes was doing on March 5, 2007 at 7:12 p.m.

Brewing coffee

— Ryan Holmes (@invoker) March 6, 2007

And before launching Instagram, CEO Kevin Systrom had some time to sip on tea.

Sitting with jack and Noah sipping on a tea

— Kevin Systrom (@kevin) June 29, 2006