dryriver writes: Earlier this year, reports suggested that Facebook lost nine million active monthly users in the U.S and two million in Britain. These figures originated from research carried out by SocialBakers in April. The figures come straight from Facebook's API, but is not the same as Facebook losing user numbers, for example. Monthly active users are the number of people who log into their account over a 30-day period. SocialBakers saw a drop in this figure prior to the report in April. Reasons for quitting Facebook were mainly privacy concerns (48.3 per cent), followed by a general dissatisfaction (13.5 per cent), negative aspects of online friends (12.6 per cent) and the feeling of getting addicted (6.0 per cent). That said, psychologist Stefan Stieger from the university recorded each of the 600 participants' responses to assessment measures based on their level of concern over various issues. Those who stopped using social media were more concerned about privacy, had higher addiction scores and tended to be more conscientious.