Digital point if quite aged website as well as highly reputed in eyes of Google as well as all the visitors. This is what makes Google crawl digital point so frequently...It certainly depends on incoming links as well...
It's all about Google's attempt at real time search and speeding up crawl time of what they deem important social sites such as twitter, facebook, myspace, and apparently digitalpoint. Matt Cutts has a video on it somewhere on the youtube webmaster channel
Has happened with my forum to. It's also about 6 years old, but that may or may nor be the reason. I use my forum to get sites indexed with anchor text links in posts yet it's supposed to be nofollow, so go figure that one.
Its bcz the DP is a very active site and google crawlers index it very fast as its updated regularly.
If you have old age domain and good back links then Google will index very fast , I checked it today on my site ! I posted two articles and with in few minutes , i found them in Google ! Digg also helps a lot to index your pages !
DP is one of the sites which are gets crawled quite frequently. It gets updated very fast and Google just loves that.
It's not that it is crawled frequented as this is largely determined by PR (higher the PR the quicker the bots come). Saw a case study for this on SEOmoz a while back. In DP's case it is generating a fantastic amount of content every minute so Google will have multiple bots on the site constantly - just because of the pure content generation.
Digital Point is a well known SEO forum recognized by Google that's why backlinks are indexed fast in this forum.
DP is one of the poopular web, and its crawl rate is very fast, thats why every thread indexed in a second
I guess this is because the V Bulletin script also do use pingometic technology just like wordpress script which pings the latest url as soon as it generates and all bots visits it then...! And other factors are DP's reputation and continuous flow of visitors Regards
its because popularity. digital point have a popularity on Google and any other search engine thats why Google index digital point pages fast