Your searches must be refined, at least for Twitter, because there are tons of examples of posting tweets with Processing.

" If possible, without be api developer."
I don't think it is possible. Not in a simple way, at least. That's why they developed an API... Such networks don't allow anonymous posting. So you need to be identified to post. And the easiest way (and most reliable) is to use the API. Perhaps you can get cookies or ids from your browser, but I don't see the advantage from the official way.

So, the best way to do what you want is to go to the developer's areas of the respective sites and to follow instructions, to study the API, and to comply. Or, alternatively, to find a library (like Twitter4j) which do most of the work already. But you still need to get a developer key from these sites.