Because people share so much information on social media, we can buy some of the most _____ advertisements available on the web.

The correct choice is targeted. When individuals share a significant amount of information on social media, it creates a wealth of data that marketers can analyze to understand user preferences, demographics, and behaviors. This allows for the creation of highly specific and tailored advertisements that reach the intended audience effectively.

Targeted advertisements are designed to appeal to particular groups based on their interests and online activity, rather than appealing to a broad audience in a generalized manner. This precision in targeting not only increases engagement rates but also enhances the likelihood of conversion, as the advertisements resonate more with individuals' specific needs and desires.

In contrast, expensive advertisements may not always be effective if they lack proper targeting. General advertisements fail to capture the nuances of individual preferences, and high-profile advertisements may not necessarily lead to better results if they lack relevance to the audience. Therefore, the ability to leverage detailed social media data results in the most targeted advertisements available online.