I found awesome tool to know whether the username is available on various social media sites or not. Just visit checkusernames and enter your desired username and this site will search across popular social media site. This tool is very helpful in two cases:

Before starting social media campaign:
If you are planning to start any social media campaign then you can check for unique username in all the social media sites. In this way, it is helpful in choosing unique/same username in all sites.

Check for your online identity:
If you have registered any domain name then you can check for your identity/profile in popular social media site. If anyone else is using your identity then you can claim for your identity and also can book the identity wherever available.

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