As a result of the several pornographic clips which were posted to Twitter's new Vine social video sharing app, the age rating for the app has now been upped to 17+; in a move which will apparently prevent the use of the app by pre-teen users.

With the Vine app getting a 17+ rating, the opening of the app will prompt a pop-up which asks the user to confirm his/her age. However, since there is no way in which the age of the user can be verified, the user's response to the pop-up query basically is an honor system.

Though the Vine app was rolled out by Twitter last month with a 12+ rating, the 17+ rating recently slapped on the app is - according to the new app description - a consequence of a number of porn posts involving, among other things, "frequent/intense sexual content or nudity."

Moreover, other than the fact that the app has now been given an adult rating, Vine will also henceforth allow its users to block a profile, as well as share their videos to Twitter and Facebook after posting.

Vine users who come across an offensive video can either block the person who has posted that video or can report about it. The option to block - or share - a profile comes up when users tap the "..." button on the top right of their profile; while the reporting option shows up when they tap the "..." button on that video, followed by a tap on `Report this post.'