It does tend to be easier to talk about online because you can always just drop links into whatever conversation if someone doesn't understand something you're talking about. Whereas in person there's still a HUGE social stigma and a lot of people seem to think that if you have depression you're just trying to "be cool". Or because so many people say "I'm depressed" about something "trivial" and it's the short term type of like a sibling-parent-grandparent-other family member-really close friend died or got a serious incurable or hard to cure disease and then a bit after have bounced back to their "normal" selves. Because of that, people seem to think that those with depression can be cured after x amount of time has passed and they'll go back to not being depressed.
As for me. I have general depression (my therapist refuses to diagnose me with specifics), general anxiety (again therapist refuses to diagnose specifics), ADD, panic attacks, I'm slightly obsessive compulsive, and (I'm going to talk to my therapist tomorrow about these two) think I may have minor PTSD and fall somewhere on the autism scale. And the depression I've had for at least 17 years. Not to mention I'm also fairly introverted so social situations take A LOT out of me (I'm still recovering from last weekend because I was around large groups of people from Thursday to late Sunday night). Also, I should mention that for me, if I do fall somewhere on the autism scale I don't see it as a mental health problem, more as a "this is who I am" thing. Though, I will agree for some people (like my little brother who is autistic, OCD, ODD, ADHD, and something else that I forget and more highly introverted than I am it is a HUGE problem) it is a mental health problem.