After Expedia Inc completes its announced plan to split into two public companies this year, the spun-off TripAdvisor will likely find more favor on Wall Street than its former parent. Shares of Expedia rose 13 percent on Friday as analysts hailed the online travel agency's separation plan as a way to unlock potential value. TripAdvisor, which sells ad revenue on its sites that feature travel reviews, has been the growth engine at Expedia in recent quarters and is seen as the part of the company with more exciting prospects. Justin Patterson, an Internet and e-commerce analyst with Morgan Keegan, said TripAdvisor revenue has risen about 34 percent year over year, while the core Expedia side of the business grew about 8 percent in 2010. Between the two assets, the spin-out has largely been designed to realize value in TripAdvisor, Patterson said. He said TripAdvisor could possibly attract buyer interest but added he couldn't think of any logical acquirers.