Some people follow pro athletes and musicians on Twitter. Some people follow porn stars. Like we do. They lead interesting lives, with their careers running relatively short, dealing with high public and moral scrutiny, all the while trying to sell themselves and their products--video and otherwise.
Women in porn don't have extremely long careers. Guys can pretty much act as long as they can, you know, perform on camera adequately. Girls have to keep up their looks as long as possible: hair, implants, tattoos, whatever happens to be the draw of the day. You can fake everything else.
Both sides of the porn debate get called out for being immoral and evil, or even ugly, on Twitter. Followers will routinely castigate an actress for being in porn, leading to the actress in question to go on a long screed of updates explaining that they're proud of what they do, have no shame, etc. You get the idea. This happens at least once a week, from what we can surmise, to some of the most popular ones.