which is the best place to get backlinks from?

Avoid spamming the social network sites as Google has become wise to this sort of spam and filter it. Also avoid building links too fast. There is no way 1000 sites are going to naturally link to your site in 2 hours. It's much better to research high PR quality sites in your niche. Call them, don't email, and have a chat with the person responsible for their site content. Explain why it would be of benefit to them (and their visitors) to link to your site and ask them if you can send them an email with more details. Get their email address and submit your link request. You'll be surprised how many agree if your site is good. Your site must be well designed and have very very good content.