This is a little old (five days based on the last update), but TrendMicro put on their blog about fake LinkedIn profiles which have links leading to malware.

The basics:

• The fake profiles are for famous people others would likely be looking for (like Paris Hilton, Beyonce, etc.)

• The malware isn't hosted on the profile page itself, but the links on the profile page take you to the malware locations.

• The malware in question throws up a GUI that calls itself MS Antispyware 2009 and is reasonably well done (meaning a lot of people can be taken by it).

• TrendMicro is calling it a trojan, but they didn't give what it does other than download itself.

With respect to the last point, it's still disturbing. Again it's a case of attackers going after a legitimate and trusted site to get users to be directed to malware. In this case they aren't hacking the site, rather using the functionality provided to end users.