Is able2know a popular ask service site.
Depends on what you consider popular. It is nowhere near as popular as Yahoo's Answers, which is the overwhelming leader in the category with their hundreds of millions of users but it is in the top 5 most popular Q&A sites on the internet.
I never see any kind of talk about this website online. What are they not marketing this website.
So you missed our Super Bowl ad? That's the last time we blow millions on that then.
I'm kidding, of course. We don't really market this site heavily. I am an expert at online marketing but I really must spend my time and money on more profitable things to market (Q&A sites are not great ways to make money) so we rely mainly on people just finding us on their own (like you seem to have, despite not being aggressively marketed to) and word of mouth. I just make sure to optimize the site well for search traffic and the growth has pretty much just been organic site growth.
But this may change, and as I have more time and money to spend (this is what I'd do with my money if I were independently wealthy) I may begin to aggressively market able2know. Until then, all we have is search traffic and word of mouth so make sure to let others know about us.