Thanks @Mittineague for the links. 
The key here is building relationships @xiaosube Unfortunately there is no such thing as ‘build it and they will come’ and never really has been. Communities are about value and motivation. If you want people to perform certain behaviours (i.e. come to your site and engage) then you need to give them a reason to do so.
Communities that survive begin with a core group of really committed members that have a strong relationship with either you or your brand – that’s their motivation. Their behaviours then form the basis of the value for future members.
Lastly, I strongly recommend against fake accounts and seed content.
At FeverBee we have a tonne of information about building and sustaining communities. I also manage a community of people that talk about it. You’re welcome to join us.
Best of luck.