Compete, an online traffic metrics provider, reports that Digg and Facebook reach the 20 million unique visitors mark for the month of May.

Digg has managed to grow their volume of visitors to about 1400 percent in a span of a year, while Facebook’s site traffic has been steadily increasing since early May since new application development platforms were launched.

Compete’s Jay Meattle noted in the company blog that about four days after YouTube hit the 20M mark, Google made a move to acquire them for 1.65B worth of Google stock. “There is certainly something magical about reaching 20 million,” he added. This means that Digg and Facebook become prime acquisition targets in the web today.

Here are Digg and Facebook’s metrics for the month of May, compared with the top social networking site, MySpace, and the largest video sharing site in the web, YouTube.

Let’s see which company acquires what within the next few months.

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