On The Spectrum is a community and resource for people on the autism spectrum.
As a registered member, you'll be able to communicate with others on the spectrum through the message board, submit articles and links, and basically take part in the great community here.
You can use the "Report" link when you come across a post that violates the site rules. You'll be prompted to write a brief reason for reporting, and the post will be immediately flagged for the message board moderators to view. Please note that you might not receive a direct reply from the moderating team for reporting a post.
That dot appears next to topics in which you have posted. It comes in handy when you're looking to see if anyone has replied to your post(s).
This is most likely your browser not recognizing that there's a new image in your avatar's spot. Try refreshing your browser by pressing Ctrl-F5 on the avatar page.
Autism is a neurodevelopmental disorder that causes abnormal social interaction, communication ability, patterns of interests, and patterns of behavior. A thorough Wikipedia article on autism can be found here.
Autism presents itself across a wide range of characteristics and levels of functioning. Therefore, many more specific disorders are collected under the autism name in a "spectrum."
Asperger's Syndrome is a form of high-functioning autism. The average person with AS is average or above-average in intelligence, but has poor social skills. A thorough Wikipedia article on AS can be found here.