Do one or more of the following:

1. Start a blog to track your learning. Try wordpress.org or blogger.com and make a schedule to post weekly. 
2. Start a Twitter account and then create a hashtag (#something) to track your tweets on a topic. Make a schedule to post a few tweets a week. Ask questions and get people discussing your topic. (www.twitter.com)
3. Create a Google Docs account to create a doc, spreadsheet or presentation to track your learning. (www.docs.google.com)