[FORUM] What social networking platforms do you use?

[rfmcdonald]

I've a rather significant electronic footprint. My two main platforms are Livejournal and Facebook, neither taking particular priority over the other (Livejournal hosts my blog and is where I've been active the longest, Facebook encompasses my Livejournal postings as well as most of my social interactions. Platforms of secondary importance Twitter (mainly as an adjunct to Facebook via SelectiveTweets and as a source of links), as well as Blogger for Demography Matters, Wordpress for Outside the Lines, and Flickr for my photographs and those of the friends and groups I follow. My particiption in LinkedIn and YouTube is nominal; the latter's more useful for simply watching videos, and LinkedIn's dominated by spam.

What social networking platforms do you use? Tell, discuss.