The phrase "a familiar topic" is correct and usable in written English.
You can use it when referring to a subject that is well-known or commonly discussed among a group of people.
Example: "During the meeting, we decided to focus on a familiar topic that everyone could contribute to."
Alternatives: "a well-known subject" or "a common theme".
The hazards of the Web as record keeper, of course, are a familiar topic.
Mr. Obama's address had a familiar topic: the need for change.
Multiculturalism is a familiar topic in Australian cinema, often explored in starkly different genres.
Songs from "Invented," like "Evidence," "Movielike" and "Coffee and Cigarettes," envision breakups, a familiar topic for the band.
Her project focused attention on a familiar topic, the proliferation of teenage drinking, from a new angle.
Joe Penhall's new play is an elegant variation on a familiar topic: the moral responsibility of the scientist.
Ms. Palin seemed to relax with Mr. Gibson later when she discussed a more familiar topic in a second interview, shown on "Nightline": her support for oil exploration in the Arctic National Wildlife Refuge in her home state.
But we can also understand this idea with an analogy to a more familiar topic: Darwin's famous Galápagos finches.
After these familiar scenes, however, worshippers at the Baptist church in Elgin, a sleepy town in east Texas, fell to discussing a less familiar topic: whether the 140th Southern Baptist Convention SBCC) had been right to boycott Walt Disney for its perceived support of homosexuals.
This focus group methodology models such an approach by exposing providers to resources while engaging them in substantive discussion about only a partially familiar topic.
Inglis lists these "stock motifs" as "a repetitive and attractive melody", "a stereotypical choice of language", "the familiar topic of lost, or unrequited, love" and "the conventional form of address from a man to a woman, in the persistent use of 'baby'".
