The following are sites where various topics related to ALS are discussed. Be aware that the info provided on these sites may - or may NOT - be well moderated. So far, I've found them to be of limited use as a source of objective information.
Patients Like Me (PLM): https://www.patientslikeme.com - In addition to forums, this site allows you to describe and track your illness and treatments, and compare with others. Site is not specific to ALS, but has some ALS-specific forums.
ALS Forums: http://www.alsforums.com/ - Mainly forums, and specific to ALS.