The phrase "are also commonplace" is correct and usable in written English.
It can be used to indicate that something is common or frequently encountered in a particular context.
Example: "In modern society, smartphones and social media are also commonplace, influencing how we communicate."
Alternatives: "are also prevalent" or "are also widespread."
Visits to graves are also commonplace.
Dual-core brains are also commonplace on smartphones and tablets.
Worries about a slowdown in China are also commonplace.
Fear of being "taken away" from family or even a special announcement being made about their condition within the school are also commonplace.
Press briefings by "senior administration officials" who demand anonymity, a standard feature of the Bush administration, are also commonplace in the Obama White House.
So, it is looking to use payments as a gateway to expand to other merchant services that are also commonplace among larger businesses but are less commonly available for smaller merchants.
Many savers did not get their money back.Corruption is also commonplace in many developing countries.
It is also commonplace throughout Washington and on the campaign trail.
Vilification campaigns against the ideologically impure were also commonplace: under Stalin, they often led to arrest, torture, and execution, though they grew much lighter after his death.
Genital cutting is also commonplace in Egypt, with some 27.2 million women falling victim to it, the largest number in a single country in the world, according to Unicef figures.
It is also commonplace, T-shirt-sloganly common, to say that to be anxious is nothing more than a rational response to precarious conditions; but what will it take for us to build that into a set of political demands, rather than try to interrogate them away with introspection and positive self-talk?
