This study shows the best way for Haverford College to increase the number of its alumni in its Linked In alumni group is to tell its alumni "Join Linked In. Then join the 1,700 alumni in the Linked In alumni group." And the fastest way for Bryn Mawr College to increase the number of alumnae in its alumnae group is to tell its alumnae who are already on LI that there is a Linked In alumnae group.