I am guessing that porn only creates traffic that gives Twitter minuscule revenue.
But is is really a policy decision -- will banning porn increase Twitter sagging stock price.
Twitter has
Twitter, Inc. (TWTR) Institutional Ownership & Holdings - NASDAQ.com TWTR Institutional Ownership 49.82%
Compared to Facebook's
http://www.nasdaq.com/symbol/fb/institutional-holdings Institutional Ownership 71.34%
These are investment banks and mutual funds -- where the money is.
There are a lot of investors that these funds represent that are large pension fund interests -- corporate America and government pension funds -- were much of this money comes from.
Facebook has always had a anti-porn stance -- look at the stock price and the valuation ...