Where do you take content for web 2.0?

Hi, guys. Where do you usually get content for your web 2.0 websites?
Personally, I use only 2 methods:
1) Get content from archieve.org from different books (here)
2) Get content from dropped domains which I find here. But this method takes pretty much time because there are tons of bad dropped domains + some of the content is already taken so you always need to check whether it is already indexed by Google...
Would be glad if someone shares some more methods, it would be a very nice contribution. Thanks!

I know people are too much about quality content but I have not found much difference in result by using them. Most of the time, I use quality spinner mixed them with Tense corrector bot and it works good for me.
Unless it is a brand web 2.0 which are read by actual visitors and you are not using them just for link building, I would advise you to hire a writer or hire VA to do the same work (scrapping from expired domain/archive)