During the hiring process, many candidates are vetted for their social media use to make sure there is nothing in their history that would embarrass the administration. Sometimes, this will lead to a candidate being disqualified from service.
However, making objectionable or political posts on social media during your time in the administration can also disqualify a candidate from a promotion within the agency, a detail to another agency, or being hired by another agency. In extreme cases, it could lead to dismissal from the administration.
It is important for the White House Liaison to clearly present what is appropriate to post, and what is not appropriate. Furthermore, agency employees are bound by the Hatch Act, which restricts political activity while holding a position of public service. Public employees may not share any political messages or posts which promote candidates for office while they are working, from their work devices, or on agency property, or they could be charged with a Hatch Act violation.
When in doubt, it is best to simply refrain from posting to prevent any future problems for the appointee.