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The minimum text will be 300 and maximum depends on the type of business you are operating
Regarding your Question
It,s depend on kind of product But if in website its, ur page u can choose the words which is benefit to consumer and concentrate in power points in your product with some pictures u needs to be more attractive but in other social media is different. you must use massage and words the consumers they like as ( emotional way, rational way mean fact in product so the worlds built in facts so as posters you will find. some time photo can talk.
Dr Wail Asad