There are several celebrities that are famous not for tv or movies, but for only the internet. Hot For Words is one of You Tube's most famous.
Her real name is Marina Orlova. She is a Russian-born philologist. According to the website wisegeek.com:
"A philologist is a type of linguist, though the exact meaning of the term has changed over the years. Philology literally means "love of words," and the field often deals with literature more than other branches of linguistics do."
Marina uses her sex appeal to increase her viewship. However, she always teaches something about a word or phrase. I enjoy her videos and always learn something new.