What does the term "Gemini feed" actually mean?

Banks’s birthday is on June the 16th, which means her star sign is Gemini. In this context, however, Banks references “Gemini” because the sign is represented by a pair of twins.

It is said that couples who are too similar to each other are less likely to last. However, in this case, the issue was not that they had too many interests in common, but that there were so many issues that the commonality became their “depressive” nature.

Taken from this annotation.