MySpace , the popular News Corp. ( NWS) social networking Web site, returned to service Monday morning after being knocked off the Internet this weekend amid record power use in its home state of California. Hipsters, slackers and those who want to be like them first saw MySpace go on the fritz at about 6:40 p.m. PST Sunday, according to a message posted on the site. MySpace users had to make due with a Pac-Man game provided by MySpace to pass the time until the Web site was back online this morning. News of the outage was first reported on CNet. MySpace users are of course unhappy, venting their frustrations in countless blogs. The outage also comes as New York-based News Corp., which bought the site for $580 million last year, is trying to turn MySpace profitable. "For any site of this size (around 80 million users), it's a setback," writes Pete Cashmore, who writes for the blog Mashable.com and follows social networking sites. "But MySpace is notoriously unreliable -- pages fail to load and users frequently receive errors -- so in many ways it's par for the course." Los Angeles-based MySpace also is trying to broaden its audience base by adding features such as job postings that could draw older users. In addition, MySpace has beefed up its security in response to criticism that it failed to protect its young users from online predators. National advertisers interested in reaching younger audiences who are difficult to find through more traditional media are taking notice of MySpace, which News Corp. sees as a key part of its Internet strategy. Toyota ( TM), Burger King ( BKC) and Pepsi's ( PEP) Aquafina bottled water all have profiles on MySpace. Rivals are trying to replicate MySpace's success. Yahoo! ( YHOO) has been adding features to its site to increase so-called user generated content, such as blogs and the sharing of photographs. Facebook , a site geared toward college students, also is surging in popularity. Even Wal-Mart ( WMT) has a social networking site for teenagers called The Hub . Shares of News Corp., also the parent company of Fox News Channel, rose 28 cents to $19.24.