By Alexei Oreskovic SAN FRANCISCO (Reuters) – One of the creators of Twitter Inc unveiled a new mobile service called Jelly on Tuesday, hoping for another hit product in what has become an increasingly crowded field of social and mobile products. The Jelly smartphone app seeks to improve the way people search for and find information, by querying people instead of Internet search engines. So if you have a question, theres somebody out there that knows the answer, said Biz Stone, the CEO and co-founder of Jelly in a video on the companys website. Stone was among the team that in 2006 created Twitter, the social network and microblogging service that had a blockbuster initial public offering in November.