A lot of people use the same username for Stack, Git, Codepen, etc. This is convenient from a personal level. 

How concerned should I be with sharing my community involvement to clients if I participate in sites like The Workplace? My username here might be the same as on StackOverflow or Git.

I am not talking about anything illegal but just sites like Workplace when it's not as directly "work related?" I'm worried clients might see it as a negative.