For universities, deciding to use social media is a no-brainer, Mashable reports. The 18- to 24-year-old college student demographic is all over the social web, and its younger counterpart (the high school crowd) is equally immersed. Alumni, recent and far-removed, use social networks to engage and stay connected with the world. Community members, parents of students, potential donors, faculty and staff and other constituents are just a tweet or “like” away. With so many key populations embracing social media, universities almost have no choice but to integrate these platforms into their marketing and communications plans…