One previous answer mentions using "than" following a pronoun. Actually, that should read "after a comparative adjective or adverb." A pronoun is a word such as: he, she, it, him, her, they, them, and similar words. These words stand for ("pro") a noun.
Adjectives provide descriptions of nouns (for the most part) and adverbs provide descriptions of verbs (for the most part). They are compared by making them stronger than another example of the same description. "Better" is the comparative form of "good," and "more" is the comparative form of " many" - and so we can say "HubPages is a better writing platform THAN eHow" or "HubPages has more examples of poetry THAN any other site on the internet."
But "than" can also be used to offer a choice of some kind (rather than, other than, etc.), and that is how the word is used in the original question.