Jeff Rangel

As a second Twitter exploit began circulating on the micro-blogging site Sunday, a teen-ager from Brooklyn told CNET News he created both worms to promote his Web site.

Much like Saturday's StalkDaily worm, the "Mikeyy" worm posts unwanted messages to users' pages. The "Mikeyy" worm began spreading on the micro-blogging site early Sunday, posting messages such as "Mikeyy I am done...," "MikeyyMikeyy is done.," and "Twitter please fix this, regards Mikeyy."

Brooklyn resident named Michael "Mikeyy" Mooney, 17, told Twitter news service BNO News that he created the worm "out of boredom."

"I usually like to find vulnerabilities within websites and try not to cause too much damage, but start a worm or something to give the developers an insight on the problem and while doing so, promoting myself or my website," he told the site.

Mooney told CNET News that the site has has been live to the public for about two weeks and has 905 members, but that it "is growing quickly because of the worm."

The messages circulating Saturday promoted StalkDaily.com, a short-messaging site similar to Twitter. While initially denying any responsibility for the worm, StalkDaily.com posted a message saying, "I have came clean and have accepted the responsibility for the worm..."

Twitter said it has closed the hole that allowed the worm to spread.

"We've taken steps to remove the offending updates, and to close the holes that allowed this 'worm' to spread," Twitter said in a statement Saturday. "No passwords, phone numbers, or other sensitive information were compromised as part of this attack."