I strongly believe that a founder should be able to explain what they do in one paragraph. I’m not a believer in the “one sentence mashup approach” (e.g. we are like pinterest + groupon + facebook for dogs). Rather, I like three sentences: (1) what we do, (2) who we do it to, and (3) why you should care. Sometimes this can be two sentences; sometimes four, but never more than a paragraph.