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LOAN FOR USE, or COMMODATUM, contracts. A bailment, or loan of an article for a certain time, to be used by the borrower, without paying for it. 2 Kent's Com. 446, 447. Sir William Jones defines it to be a bailment of a thing for a certain time, to be used by the borrower, without paying for it. Jones' Bailm. 118. According to the Louisiana Code, art. 2864, it is an agreement by which a person delivers a thing to another, to use it according to its natural destination, or according to the agreement, under an obligation on the part of the borrower, to return it after he shall have done using it. This loan is essentially gratuitous. The Code Civil, art. 1875, defines it in nearly the same words. Lord Holt has defined this bailment to be, when goods or chattels, that are useful, are lent to a friend gratis, to be used by him: and it is called commodatum, he adds, because the thing is to be restored in specie. 2 Ld. Ray. 909, 913. (A Law Dictionary)

After public figures including author Stephen King made clear they would not pay to provide content to Twitter, the company provided gratis check marks for some celebrities but not others. (Yahoo)