Bitcoin Forum

 Now lets say you are building a company (like I am trying right now) based on games for bitcoin community. Where do you register and open an account?

 I found ;

 Here
 Twitter
 Facebook
 Reddit
 Moneypot
 All The casino's I could find
 Some other crypto forums
 

 What else would you suggest?

You can add stumbleupon the snowball effect on this social site is so awesome once many people liking and recommending your site you can have almost an unlimited hits to your site but of course you need a very good and highly informative site

You can also introduce your site to this bitcoin forum.
and use Traffic exchangers also to promote your site

I'm surprised the signature poster didn't recommend signature campaign :P
As the site is BTC related, running a signature ad campaign would be pretty good too.

What he said is right and true.

Sig campaigns ads are a good and effective way of spreading your business logo and link around with people's posts.

I suggest also to get up a linkedin account (unless you are planning to scam :P :P )

Signature campaigns are looked down on and ignored by most high ranking members of the forum. It may seem like a good idea, but honestly, a signature campaign doesn't boost your traffic up by much.

You're forgetting that even high ranking members join signature campaigns. It's pretty tempting for a hero member to join a campaign and get paid ten cents a post. People with signature campaigns aren't always looked down upon. There are plenty of good people on this forum that have signature campaigns and are still very respected people on bitcointalk. Of course, many campaigners are extremely spammy and that's what makes people like me looked down upon.

Yes this is the best way I think, Because this forum attracts a lot of people and already has some good exposure for your company.
And also to the right customers straight away, also i've seen some twitter campaigns that could also work.
U pay people with a lot of followers to promote u'r product/company

Anywhere the bitcoin community hangs out. Perhaps you would also like to interest gamers (non bitcoin)

well you can register for your own company a linked in profile. Many job seekers will search everyday for jobs and many will love working for bitcoin based company

You got the main ones covered. But it's not about quantity but about quality. With to many accounts on social media, you'll struggle to keep them all active and engaging. Focus on 1 or 2, and use other channels just for announcements.

What type of business are you trying to build? How do you intend to generate income?

You could try some ad networks like mellowads.
Make yourself some  nice banners and advertise allover the net.
Mellowads could give you free credits(faucet) for ad campaigns.

 Guys I am not asking advertisement ideas .
 
 Not mellowads
 Not signature campaign.

 
 I am simply asking which sites should I register the name. Thats it.

"[company] based on games for bitcoin community" doesn't say much. You want to open another casino? Free online games? Gambling sites review website?

You could also try:

Voat.co (alternative to reddit)
forum.bitcoin.com

moneymakegroup.com? There are tons of people in there I think. You could also try thebot.net.
I can't think much more. I guess the facebook and twitter shall do the trick if you want to promote it outside the forum.

Goodluck with the promotion!

 Do you really think gambling review website is based on games for bitcoin community? I mean games , I understand casino could be considered games but review of them is definetly not.

 It will be just gaming company. We will probably first code some casino and try to make some funds for us but main idea is to become a gaming company. Couple of simple games into one day hopefully huge games.