Shares of TripAdvisor popped nearly 7% yesterday after John Malone's Liberty Interactive paid a healthy premium to grow its stake in the travel reviews website. Liberty Interactive was willing to pay a 63% premium for Barry Diller's stake -- shelling out $62.50 a pop for millions of shares when the market was pricing TripAdvisor in the low $40s -- because of a unique arrangement between Malone and Diller. Diller's ownership was just for 3% of the company, but he held super-voting power for the stock owned by Liberty Interactive. Buying Diller out removes that ability. Liberty Interactive now owns 22% of TripAdivsor, but a controlling 57% chunk of the voting power. Investors shouldn't get too excited here. Malone is unlikely to be willing to pay nearly as much for the rest of the company -- and that's even if he wants a bigger piece of TripAdvisor. Online travel-booking websites have been trading lower lately on fears that the fiscal cliff will result in a drop next year in corporate and leisure travel.