What do you do if you freinds are far away?

hey, im in college and i have friends from may two past boarding schools and from my school in america. im now at a normal college in england and i find it extremely hard to keep up with everyone as the work load has been piling up not only in college but at home and in my daily life too. how do i keep up with everyone? i miss them all and i dont want to stop taking to them