Link multiple community sites

Hi there,

dont really know where to put this… so I thought I just put it under random.
We (me and my band members --> www.palloc.nl) are currently thinking about a new website. As every band these days we also have accounts on some communty sites. (Myspace, Hyves (dutch), perhaps some more… I dont really care about communities) Now I thought it would be great to only have to maintain one of these sites. So does anybody has some ideas how I could link information (like events/gigs, bio, blog) between different community sites? I have read about OpenSocial but Im not sure if that’s the right thing.

Any ideas?