If you want to keep up to speed with social networking trends, take a look at Hitwise’s Social Networking Report. The report has just been released and is available for free online by simply filling in a form on the Hitwise website.
Also, there has been a lot of talk lately about ways to aggregate social networks. Effectively this means providing an overview of your account and/or friends across sites like MySpace, Facebook, LinkedIn, Orkut and the like and the sites generally can pull together some summary information and updates. Here are some of the ones I have come across so far:
Of course in order to get the full value for these, you need to be actively using more than one social network at a time and in most cases be prepared to share your log in details with these sites. Some of the sites are also in beta phase so don’t expect it all to be smooth running.
There are plenty of reviews of all of these sites out there, so rather than reinvent the wheel, I can recommend this overview.