Amitabh posted a collage of images of himself with his co-actors like Shatrughan Sinha and Dharmendra, while several others tried to decode what friendship means.Here is what the celebrities had to say on Twitter: Amitabh Bachchan: Happy Friendship day. Karan Johar: Friendship... the phenomenon that allows you to love someone unconditionally without the pressures and drama of sexual dynamics.

Resul Pookutty: To all my friends and wanting to be friends, Happy Friendship Day! You have played a great role in my journey, truly and genuinely.

Prosenjit Chatterjee: I can't even imagine where I would be today were it not for that handful of friends who have given me a heart full of joy. Happy Friendship Day. Shahid Kapoor: Happy Friendship Day to all of you and to a friend who is always with me. Sonam Kapoor: Happy Friendship Day guys! Anupam Kher: Here is wishing everyone Happy Friendship Day from my side and from my school's side.

Sanjay Gupta: Happy Friendship Day. I'm celebrating with my best friends like I do on all Sundays, Sunday Brunch with my wife and kids. Vishal Dadlani: On Friendship Day, I want to wish my RSS friends remind them to put cow-dung on their phones. For good health.

Bipasha Basu: Blessed with amazing friends. Happy friendship day to all. Vivek Agnihotri: Good morning. Happy friendship day Sunil Grover: As a doctor, I want to wish you a happy very friendship day. What a busy day! Mugdha Godse: Happy friendship day to all of you... Two good friends and you are the richest person in the world...

Ameesha Patel: A very happy friendship day to all my tweethearts ... You are my family not just friends. So happy family day to all of you.

Tanuj Garg:  Happy Friendship Day to the special few in my life! You'll know who you are! Thanks for being there and for being you.