He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me. —
Thomas Jefferson
I use Wikipedia as a self-education tool. I do not do this by reading and implicitly trusting articles, but rather by reading and editing articles. When I have completed editing an article, I have:
learned from it,
verified its accuracy, and
improved it in some way.
I believe this process is one of the best educational tools available. And it pays both to me and to anyone else who may read that article.