Frequently, a schizoid individual's social functioning improves, sometimes dramatically, when the individual knows he is an anonymous participant in a real-time conversation or correspondence, e.g. in an online chatroom or message board. Indeed, it is often the case the individual's online correspondent will report nothing amiss in the individual's engagement and affect. A 2013 study looking at personality disorders and Internet use found that being online more hours per day predicted signs of SPD. Additionally, SPD correlated with lower phone call use and fewer Facebook friends.