In Anglophone countries, Heathen groups are typically called "kindreds" or "hearths", or alternately sometimes as "fellowships", "tribes", or "garths". These are small groups, often family units, and usually consist of between five and fifteen members. They are often bound together by oaths of loyalty, with strict screening procedures regulating the admittance of new members. Prospective members may undergo a probationary period before they are fully accepted and welcomed into the group, while other groups remain closed to all new members. Heathen groups are largely independent and autonomous, although they typically network with other Heathen groups, particularly in their region. There are other followers of the religion who are not affiliated with such groups, operating as solitary practitioners, with these individuals often remaining in contact with other practitioners through social media. A 2015 survey found that the majority of Heathens identified as solitary practitioners, with Northern Europe constituting an exception to this; here, the majority of Heathens reported involvement in groups.