You can find many posting sites for CPA marketing. Some of the best ones include forums, social media, and classified ad sites. Facebook and Instagram are great for reaching a large audience. You should join groups that relate to your niche and engage with users. Reddit is another good platform where you can share offers in relevant subreddits but you must be careful. Quora allows you to answer questions and link to your offers but you must be on the right track. Classified ad sites like Craigslist can also help to drive track to your offer. You should focus on platforms that offer high engagement to drive traffic and increase your chance to make more money. The best posting site depends on where your target audience spends time.