Currently there is not a way to do this you could submit an idea to see this in the future. However, as a work around you could create a Watchlist with all variations of the Source User name you are looking to collect.
Don't forget, when your helpful posts earn a kudos or get accepted as a solution you can unlock perks and badges. Those aren't the only badges, either. How many can you collect? Click here to learn more.
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New to the forums or need help finding your way around the forums? There's a whole hub of community resources to help you.