How to write a script for spamming comments in facebook/vkontakte/classmates (by what means?)?

Question

Facebook

I want to write a script for posting comments on facebook, vkontakte, classmates. I see at least 3 ways:
1. It's stupid to send HTTP requests.
2. Use the API (VK API, for example, supports the function of posting messages).
3. AutoIT, managed browser and the like.
As I understand it, there are very simple methods (VK API, for example), but they can be banned very easily (I don’t know what anti-spam technologies are used in these social networks). On the one hand, I want the method to be guaranteed to work (so that there is no such thing as what you did, and then you get banned every 10 messages). On the other hand, you don’t want to have hemorrhoids, so all sorts of managed browsers only if everything else does not work. Here, in fact, is the question for people with experience: how to do IT with a guarantee and with the least hemorrhoids?