Here’s an entry you would not expect to see on Barack Obama’s official profile on the social networking site Facebook: “Barack Obama is now friends with Antonin ‘Tony’ Rezko.”

But that’s the first item on Mr. Obama’s “FriendFeed” on BarackBook.com, a Facebook parody site created by the Republican National Committee that it says will go live on Tuesday. According to the R.N.C, the site is intended to showcase some of Mr. Obama’s “notable associations.”

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Each profile is set to include videos, news articles and sections like “Facts About Me and Barack,” “My Donations and Bundling for Barack” and “What Barack Says About Me.” The R.N.C. says it plans to continue updating BarackBook between now and the election. (Notably, the Rev. Jeremiah A. Wright, Mr. Obama’s controversial former pastor, does not yet have a profile.)

Users of Facebook – the real one – may be able to install an application on their personal page with links to BarackBook.

Alex Conant, a spokesman for the R.N.C. called the planned site “an interactive way to learn more about Obama’s poor judgment.”

But in using a faux social networking site to highlight what it considers to be some of Mr. Obama’s more controversial acquaintances — past and present — the R.N.C. is also opening itself up to the inevitable comparisons between the Obama campaign’s online efforts and those of his rival, Senator John McCain.

While there is no single metric for success on the Internet, there are some leading indicators. For example, Mr. Obama has about 1.2 million Facebook friends, while Mr. McCain has fewer than 200,000. But the Republicans are making an effort to catch up in the e-campaign. Last week the R.N.C. launched a new Internet browser toolbar to collect “micro-donations” from supporters.

And as the Republicans are trying to point out with their twist on Facebook, having lots of friends can have its downsides.