On the use of hypocorisms on publications and university personnel list
Typically, you have full choice over which variant of your name you choose to publish under. 

I know people who use a shortened version of their first name, substitute their (preferred) middle name, use their pre-marriage last name, etc. Publishers don't care and funding agencies use stronger unique identifiers.  I doubt that places like ResearchGate and Academia.edu constrain you either.

Just be sure to be consistent, and consider ORCID to help with disambiguation.