The lack of an "and" between "delete inflammatory content" and "block users" unambiguously makes it a list of three items. The oxford comma, while useful, is not necessary here.

So you're saying the obvious interpretation of the text is impossible to render because you insert grouping breaks where you please? I reject that.

According to your "obvious" interpretation, the sentence is:

"We found that people like some features that are already present in social media, like the ability to delete inflammatory content, block users who do X."

Does that sound like a grammatically correct complete sentence?