By: Addison Wylie Grace Helbig, Mamrie Hart, and Hannah Hart are three charismatic personalities who have found impressive fame through YouTube.  Each actress has found their calling (whether its through video blogging, cooking, or both) and have deservedly garnered lots of attention for it, which has then followed with more victories (Hannah now has a cook book, Helbig hosts her own show on E!, and Mamrie is a writer who earns steady work). What’s important…