Gigya is a very useful tool in developing  software . it helps you to socialize your site instantly like social sign-in, sharing and commenting. Gigya have scripts for these that do work in a minute. Though Gigya is very helpful, still we have to evaluate its PRO's and CON's.

Pro's:

• Flexible and Customizable - they have a handy wizard-like tool that can help you to customize everything. aside from that, you can also modify its actual javascript code when you need
• It is Fast - they store a lot of  key information in cache so whenever you call a function they give immediate response.
• Direct API calls to Providers - you dont have to stick into their platform. Gigya can do a direct API calls to facebok and you can also use it to other social networking sites such as twitter and other providers after some modifications
• Multiple Social Network Connections - they have this showAddConnectionsUI that enables a user to establish simultaneous multiple social networks connection.