Google, Yahoo and Microsoft websites maintained their position as the top three most popular web properties in September.

In its report for September 2011, comScore named Google’s U.S. websites as the most frequently visited pages in the country with more than 218 million unique visitors. Marketers should take this as their cue that search marketing can pay off, as it serves a large portion of Google visitors.

In keeping with previous months’ reports, Yahoo and Microsoft sites ranked second and third respectively. While search is a major driver for these companies, use of their popular email services and other products is also critical to their success.

Social media websites Facebook (fourth), LinkedIn (30th) and Twitter (33rd) were also in the top 50. Compared to August 2011, only LinkedIn saw any change, moving for 31st to 30th.

For marketers, the popularity of these websites demonstrates the possibilities offered by social media marketing and SEO campaigns, as search and social continue to grow.

Brafton recently reported that Microsoft is trying to push Bing, its search engine, aggressively. Speaking at the Web 2.0 Summit this week, Microsoft CEO Steve Ballmer urged users to give Bing a try, since, as he says, results yielded by Google and Bing are identical about 70 percent of the time.

Joe Meloni is Brafton's former Executive News and Content Writer. He studied journalism at the University of Massachusetts, Amherst, and has written for a number of print and web-based publications.