This post is mainly intended to group and list all the famous Indian film stars who are on twitter from multiple cine industries in India like Bollywood, Tollywood and kollywood etc. I would like to add as much as possible, and I request people reading this article to add more people relevant to this post to help others who are searching for their favorite personalities from film industry in India.
Happy tweating and the list goes as below ... I wish more people come and join in twitter to share their feelings and to be close to their loved ones.
Note : Most of the persons below are linked to Wiki, to know more about the persons try to click on the name of the person if it is linked.
Tollywood : 
All Telugu film stars updates you can see on page itself >> click this 
http://www.krishnababug.com/2010/05/telugu-film-stars-twitter-updates-on.html

Prince Mahesh babu : http://twitter.com/urstrulyMahesh
Akkineni Nagarjuna :  http://twitter.com/iamnagarjuna 

Daggupati Raana : http://twitter.com/RanaDaggubati
(Leader fame - D.Rama naidu Grand son)
Siddharth : http://twitter.com/Actor_Siddharth
(Bommarillu fame)
Hansika : http://twitter.com/starhansika
Genilia : http://twitter.com/geneliad
Manchu Lakshmi : https://twitter.com/HRHLakshmi 
(Dr. Mohan Babu's daughter) 
Sumanth : https://twitter.com/Isumanth


Kollywood:

Rajini Kanth : http://twitter.com/rajnikanth
R Madhavan : http://twitter.com/ActorMadhavan
Trisha krishnan: https://twitter.com/trishtrashers
(Varsham(Telugu movie) fame)
Shriya : http://twitter.com/Shriya_S
Priya : http://twitter.com/PriyaWajAnand
(Leader fame)
Richa : http://twitter.com/richa320
(Leader fame)
Samantha : http://twitter.com/samanthaactress
("Em maya chesave" fame)
Asin: http://twitter.com/asin_thottumkal
(Gajini fame)

Bollywood :

Karan Johar: http://twitter.com/kjohar25
Sharukh khan : http://twitter.com/IAMSRK
Amita bachchan : http://twitter.com/amitabh_bigb
Abhishek bachchan : http://twitter.com/juniorbachchan
Sameera Reddy : http://twitter.com/reddysameera
Sonam Kapoor : http://twitter.com/sonamakapoor
Akshay Kumar : http://twitter.com/akki67
Preeti Zinta : http://twitter.com/preityzinta

Sports stars :

Sachin Tendulkar : http://twitter.com/sachin_rt
Sania mirza: http://twitter.com/MirzaSania
M S Dhoni : http://twitter.com/MahendraDhoni
Lalith modi : https://twitter.com/LalitKModi
(Ex-IPL Chairman)

Politicians :

Rahul Gandhi : http://twitter.com/RGamethi
Narendra Modi : http://twitter.com/Narendra_Modi

Others :

Barak Obama : http://twitter.com/BarackObama
Drujoy Datta : http://twitter.com/durjoydatta
(Of course I L U book author)
Allu Sirish : https://twitter.com/allusirish
(South scope magazine owner)
Chetan Bhagat : https://twitter.com/chetan_bhagat
(Famous Indian author)

Hollywood :
Jim carrey : https://twitter.com/JimCarrey 
 
Useful links : [1][2]
Technorati Tags: Twitter, indians, celebrities, film stars,
P.S : BTW you can follow me on twitter ... http://twitter.com/krishnabab
To know more about the person click on his name to see his wiki page or any other his site with his information.