Hello,
I have looked into Autism/Aspergers-based dating sites; They are quite inactive and disappointing, overall.
There are many mainstream dating sites, of course. They can be interesting and at times promising if you are able to first wade through the shameless self-promotion and greediness of the NT world.
I met a Woman on one of these sites last Winter and we dated heavily for a number of Months; It was quite enjoyable and pleasant.
So, it is possible for those on the spectrum to meet others online but it can be frustrating at times.