Public Profiles
Here's an incomplete list of my public profiles in various internet services. 
LinkedIn is a business-oriented social networking site mainly used for professional networking.
http://www.linkedin.com/in/tomasv
Ohloh is a website which provides a web services suite and online community platform that aims to map the landscape of open source software development.
http://www.ohloh.net/accounts/spajus
SlideShare is a free service for sharing presentations and slideshows over the web.
http://www.slideshare.net/spajus
Tumblr makes it effortless to share text, photos, quotes, links, music, and videos, from your browser, phone, desktop, email, or wherever you happen to be.
Twitter is a social networking and micro-blogging service that allows its users to send and read other users' updates (otherwise known as tweets), which are text-based posts of up to 140 characters in length.