Sims can create "Simstagram" accounts to gain followers, post photos, and record videos to attract sponsorships.

If you are looking for a mod that specifically allows you to run a commercial enterprise from your home lot, the Live in Business mod by LittleMsSam is the industry standard. It enables:

Sims can practice acting skills (drama, false emotions) and film movie scenes to earn Simoleons.

This mod is a complete overhaul of the celebrity and business system, offering a more interactive experience than the standard Get Famous expansion.