Bitcointalk.org is where the community is. It is where problems can be dealt with and discussions can be had bringing together diverse bitcoiners.
Bitcointalk.org is the main Bitcoin and altcoin discussion forum, includes subforums for technical support, mining, development and economics.
Martti Malmi a.k.a. “Sirius” is the founder of the Bitcoin Forum. He was the second Bitcoin developer after Satoshi Nakamoto. He is not an active developer anymore, but continues to manage the domain names bitcointalk.org and bitcoin.org.
Head administrator of the Bitcoin Forum and /r/Bitcoin is the user “Theymos”. He currently owns the “Bitcoin Wiki” bitcoin.it domain name and wrote the Bitcoin Block Explorer, but doesn’t run it anymore.