You can use "Username Check" for free here

Try Username Check with different words or names. Curious about even more original features? Then go to the awesome NameRobot Naming Toolbox, where there is Username Check with all the trimmings. There are even more name generators and clever tools for word search, naming, and inspiration.

Check the availability of your name ideas across all social networks and other Internet portals with just one click.

Do you want to use Social Media Marketing for your new company or product? Then you should make sure that nobody else has already registered your name idea in the social networks.

Naturally, you don't have to set up profiles on all of the available platforms. In the B2B area, the large networks LinkedIn, Xing or Twitter may be sufficient. Freelance artists might consider portals such as DeviantArt or Flickr. But secured is secured: Because if someone else uses your name somewhere later on, you have no control over what happens there under that same name.

The Username Check checks whether a name is still available as a username (like on Twitter, for example) or as a URL such as on Facebook: www.facebook.com/ihrname.