After you've searched for topics of interest in "Groups" above and in the "Forums", don't forget to look at recent activity which hides along the right margin of the page all the way at the bottom.
On a personal note, I've developed an animated gif technique, sort of “pull quote marries slideshow”. Samples are scattered across various groups, but you can find them easily by going to my twitter account. Each tweet has a link (after the description and before the hashtags) to a visually rich example here at Atheist Nexus. If you like them, please follow me
Hello Alex You are most welcome joining this internet world of rationality and peace, and of common sense and freethinking wisdom, that is common to non-believers and critical thinkers like you and us. We invite you to join the busy group "ORIGINS: Universe, Astronomy, Life, Earth, Humans, Religion, Gods, Atheism, Evolution, Darwin..." with 740 discussion topics and 3750 members. http://www.atheistnexus.org/group/originsuniverselifehumankindanddarwin