An individual that migrates from one website that is not meeting their needs to a website that they believe can meet their needs and offer them the access, space, assistance and/or in some cases improved services that they need.
Sam, her lover and their daughter transferred from a web community that could no longer provide the access, space, assistance and/or improved web services their family needed.
Sam, her Lover and their daughter became webigrants when they had to switch from one web community to another.
Someone that just immigrated to the interwebs.
Look at this webigrant. He doesn't even know what google.com is.