The "Gunday" star, who joined yesterday, was welcomed by all the prominent faces from the industry including Karan Johar, Abhishek Bachchan, Anushka Sharma, Nargis Fakhri and Priyanka Chopra among others.
Arjun, 28, first tweeted that he is being tutored by his sister Anshula Kapoor on how to handle his Twitter account.
"I am being tutored by @anshulakapoor as we speak on how to handle my handle...," his tweet read.
Johar welcomed Arjun saying, "Arjun Kapoor on twitter!"
Anushka Sharma said, "Joon !! Welcome ya!
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Nargis Fakhri wrote, "Finally we have you on here! Welcome"
Parineeti Chopra wrote, "The one and only. Arjun baba!"
Arjun's 'Two States' co-star Alia Bahtt also welcomed him saying, "And @arjunk26 is finally on twitter! C'mon give him all the love you've built up since forever.