Social networks had a record number of unique U.S. visitors in April, mainly on the strength of Twitter and Facebook, comScore reports. Social networks grew 12 percent last month to nearly 140 million visitors – nearly 75 percent of the total U.S. online population. Incredibly, MySpace still has more visitors than Facebook, albeit by a slim margin of 71 million to 67.5 million. Last week, I visited my MySpace profile for the first time in at least six months and found it vacant, many of my friends having deleted their profiles.

Not to say there were tumbleweeds, but it was a lot quieter in there than in the Big Two. I almost jumped when my profile song -- Battles' "Atlas," very 2007 -- started playing at top volume. Very intrusive, especially when not expected, the profile song.

Very 2007.

Outside of socnets, the biggest growth in unique visitors in April was the Center for Disease Control, as users sought information on the Swine Flu outbreak. Twitter was the fourth-fastest growing site last month, and is now the 56th ranked site in the U.S.

The rankings also reflect les sacres du printemps:, the home of Major League Baseball, was the fifth top gaining site in April, as the season finally began. There was also a significant increase of visitors to real estate and home-repair sites, as “the start of spring led many Americans to consider home repairs and remodeling.”

While growth continues in communication and information-gathering on the internet, e-commerce flatlined in April.

In a teleconference Thursday, comScore Chairman Gian Fulgoni said the e-commerce has reached its nadir.

"I think we bottomed out," Fulgoni said. But "if that continues, we are not going to get out of this mess we are in as quickly as we would like," he said. It might take quite a while for e-commerce to rebound, Fulgoni added.

Fulgoni also reported some troubling statistics from comScore’s latest survey: four out of five participants said they were “more afraid” than ever of their economic future.

By Mark Alvarez