Facebook Inc's (NASDAQ:FB) photo-sharing service, Instagram, said it had more than 300 million users, sharing over 70 million photos and videos each day.
Microblogging service Twitter Inc (NYSE:TWTR) has 284 million active users, according to its website.
Four-year-old Instagram crossed 200 million users in March.
The service, bought by Facebook in April 2012, also said in a blog that users would now see a "verified" badge for celebrities, athletes and brands as Instagram pushes to deactivate spam accounts.
Instagram also said on Wednesday it will permanently delete spam accounts, which may cause a drop in some users' follower counts.
(Reporting by Anya George Tharakan in Bengaluru; Editing by Joyjeet Das)