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Abstract: Contact surgery provides an effective way to produce contact 3-manifolds. According to a result of Ding and Geiges, any closed contact 3-manifold can be given as contact (+1)- or (-1)-surgery along a Legendrian link in the standard 3-sphere. Using Heegaard Floer theory we show instances when such structures can be distinguished (up to contact isotopy), and when tightness of such structures can be verified with the use of the recently defined Ozsvath-Szabo contact invariants. Examples of tight nonfillable contact 3-manifolds will be also given.