Building a brand – personal or corporate – is all about (positive) reinforcement. The more uniform your brand is – same usernames everywhere, same avatar everywhere – the more it will be reinforced. Easier to manage too, with just one username to remember.

If I understand what you meant by “cause issues” then yes, you want to make sure that wherever you reuse a username it’s done in a way that harmonizes with your brand. Otherwise, that’s a good place to use a different username.

Also, thanks for the post on username checking tools. I do have a question – do you find that having the same username helps in creating a more recognizable brand? Does having multiple cause issues or water down your branding efforts? Please let me know.