Some boards are maintained by private persons, who sell space on them for advertising, notifications, and personal messages.
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To be sure, many folks, presumably poorer folks, or at least folks less ready to part with a tarsk bit, simply inscribe their messages, in effect as graffiti, on pillars, walls of buildings, and such.
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Too, posters, and such, usually hand-inked, are common in public places, usually put up by the owners or managers of palestrae, or gymnasiums, public baths, taverns, race courses, theaters, and such.