Most of us have contacts scattered across various social networks and mailboxes. Until now, getting them all in one convenient place required awkward manual importing/exporting or using services that are only partially free. Web app Neiio is an elegant, smart and free solution.
Neiio supports importing contact information from Facebook, LinkedIn, Viadeo, Google, Yahoo! Mail, Hotmail and Outlook (as well as external files and, in pro versions, Salesforce and Nelis XRM). And it can export your contacts to Gmail, Yahoo! Mail, Outlook, vCards or Excel -- or send the vCards to your mobile phone (Android, iPhone, Blackberry and Windows Phone 7).
The fact that it does this so easily and supports multiple platforms for free is great just on its own, but Neiio really impresses with its intelligent organisation of your contacts before you export them. Using the "Clever Groups" automatic generation, Neiio can group your contacts into meaningful groups. In my tests, for example, it put my relatives on Facebook into one group and people I correspond to most there in another. You can, of course, consolidate all contacts from every network into one main list if you want or create your own groups. Additional filters include selecting only those contacts with full names, email addresses and/or phone numbers.
When trying the service, LinkedIn wasn't connecting for me, unfortunately, but the quick sending of groups to (and subsequent import into) my Android phone worked very smoothly.
If you want (finally) to merge all your contacts into one list, with as little effort and cost as possible, go take a look at Neiio.