Colleges and universities ought to take action against students found to have engaged in "direct-sale" prostitution via social-network websites like Hi5, according to a well-known academic. Assoc Prof Sukhum Chaloeysap of Suan Dusit Rajabhat University said all institutes of higher learning should admit the problem existed and join forces to combat it. Some students are said to have touted sexual services on Hi5, which has links to more than 1,000 other websites that openly post students' pictures, many in uniform, and suggestive messages. He urged the principals of colleges and universities to investigate. Many students' part-time jobs are affected by the economic slowdown, driving some to prostitution to earn extra money, he said.