  We describe the Picard group of a tame stacky curve as an extension of two
groups, which depend on the gerbe class of the curve over its rigidification, a
stacky curve with trivial generic stabilizer, and the residual gerbes of the
rigidification. After presenting the general formulation, we compute some
specific examples. In particular, we provide an example highlighting the fact
that the extension of the groups truly depends on the class of the gerbe.
