Many sites have attempt to copy btctalk and even pay their visitors to post there but no one succeed. They are still a plain forum with no signature campaign in the line.
Yes I saw also other forum like a local forum but I'm quite hesitant to join like I'm thinking that it's a scam and I'm just wasting my time there. I only trust this forum and it helps me a lot since then so I must say bitcointalk.org is the best among the rest.
This forum is the most trusted website out there. There's no need to look for another. Startup Companies that are posting in here are also trusted by the users that already invested in their coin. Another thing is that the risk of being scammed in the other websites are very high.