Teammate Nathan Redmond says he's also given up on social media.
“I think you put unnecessary pressure on yourself," Long told the club's website. “I don't take any notice when I'm doing well and people are praising me, so why should I pay attention to all the negative things being said about me?
“I didn't talk to Redders about it, but he's obviously had a good season and you can see he's more confident in himself and playing well, so there could be a lot to be said about that.
“The younger age grow up with social media, so hopefully it doesn't pollute their minds as they get older.
“I think the older players can laugh it off, but it's never nice to read, even if you don't really take any notice. Why put yourself in that position?
“I know the fans of Southampton like the way I work for the team, but there's always that argument 'he doesn't score enough goals'. You've got to accept that as well.
“Coming off Twitter has been good for me – I don't read any negative stuff. I'm my own worst and best critic – I know what I've done well and what I need to improve on.
“Those people writing on Twitter can't change it. It's only me who can change it."