More than a problem for twitter, the issue it is for Apple appstore:
http://www.theverge.com/2013/1/27/39...t-to-get-worse
"A cursory search of #porn and related hashtags within the Twitter iOS app unearths a cornucopia of adult material, yet Apple has taken no action in the case of that app."
"Porn is so easy to find on Vine, will it be lifted from App Store?"
http://www.pocket-lint.com/news/4952...lift-vine-porn
"Users of Twitter?s new Vine app greeted with porn as top Editor?s Pick"
http://9to5mac.com/2013/01/28/users-...-editors-pick/
There's already web sites showing last vines, but without option to select hashtag such as #porn:
http://vinepeek.com/
Vineroulette let select so is more a search engine, but searching porn I do not see any porn really, while pussy find cats:
http://www.vineroulette.com/show.html?query=porn
http://www.vineroulette.com/show.html?query=pussy
There's a little more luck at nsfw, but sure can't be as entertaining as browsing a tube:
http://www.vineroulette.com/show.html?query=nsfw
Much like chatroulette, if searching for gay stuff, that you can find in big amount:
http://www.vineroulette.com/show.html?query=dick